Pastable version of Repetitive Calculator Code

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 <pre class="sunburst">function full_reset(form) {
cost_per_unit.innerHTML = &quot;&quot;
charge_per_unit.innerHTML = &quot;&quot;
}

function addEvent(els, type, func) {
	if(!(els instanceof Array)) els = [els];
	for(var i=0, n=els.length; i&lt;n; ++i) {
		if(els[i].addEventListener) els[i].addEventListener(type, func, false);
		else els[i].attachEvent(&quot;on&quot;+type, func);
	}
}

String.prototype.trim = function() {
	return this.replace(/^\s+/, &quot;&quot;).replace(/\s+$/, &quot;&quot;);
};

var quantity = document.getElementById(&quot;quantity&quot;);
var cost = document.getElementById(&quot;cost&quot;);
var charge = document.getElementById(&quot;charge&quot;);
var profit_amount = document.getElementById(&quot;profit_amount&quot;);
var profit_percent = document.getElementById(&quot;profit_percent&quot;);
var tax = document.getElementById(&quot;tax&quot;);
var cost_per_unit = document.getElementById(&quot;cost_per_unit&quot;);
var charge_per_unit = document.getElementById(&quot;charge_per_unit&quot;);
var subtotal = document.getElementById(&quot;subtotal&quot;);
var discount = document.getElementById(&quot;discount&quot;);
var discount_amount = document.getElementById(&quot;discount_amount&quot;);
var total = document.getElementById(&quot;total&quot;);
var dpp = document.getElementById(&quot;dpp&quot;);
var dpa = document.getElementById(&quot;dpa&quot;);
var dcc = document.getElementById(&quot;dcc&quot;);
var dt = document.getElementById(&quot;dt&quot;);
var dst = document.getElementById(&quot;dst&quot;);

addEvent(
	[cost, charge],
	&quot;keyup&quot;,
	function(e) {
		var vcost = cost.value.trim(); var vcharge = charge.value.trim();
		var ncost = vcost*1; var ncharge = vcharge*1;
		if(vcost==&quot;&quot; || vcharge==&quot;&quot; || isNaN(ncost) || isNaN(ncharge)) {
			profit_amount.value = profit_percent.value = &quot;&quot;;
			return;
		}
		prof = (ncharge - ncost).toFixed(2)
		
		profit_amount.value = prof;
		profit_percent.value = (prof/ncharge*100).toFixed(2);
		discount.value = &quot;&quot;
		dcc.innerHTML = &quot;&quot;;
 dt.innerHTML = &quot;&quot;;
 dst.innerHTML = &quot;&quot;;
 dpa.innerHTML = &quot;&quot;;
 dpp.innerHTML = &quot;&quot;;
	}
);
addEvent(
 [cost, profit_percent],
 &quot;keyup&quot;,
 function(e) {
 var vcost = cost.value.trim(); var vprofit_percent = profit_percent.value.trim();
 var ncost = vcost*1; var nprofit_percent = vprofit_percent*1;
 if(vcost==&quot;&quot; || vprofit_percent==&quot;&quot; || isNaN(ncost) || isNaN(nprofit_percent)) {
 profit_amount.value = &quot;&quot;;
 return;
 }
 profit_amount.value = (ncost / nprofit_percent * 100).toFixed(2);
 charge.value = (ncost + (ncost / nprofit_percent *100)).toFixed(2);
 discount.value = &quot;&quot;;
 dcc.innerHTML = &quot;&quot;;
 dt.innerHTML = &quot;&quot;;
 dst.innerHTML = &quot;&quot;;
 dpa.innerHTML = &quot;&quot;;
 dpp.innerHTML = &quot;&quot;;
 }
);
addEvent(
	[cost, profit_amount],
	&quot;keyup&quot;,
	function(f) {
		var vcost = cost.value.trim(); var vprofit_amount = profit_amount.value.trim();
		var ncost = vcost*1; var nprofit_amount = vprofit_amount*1;
		if(vcost==&quot;&quot; || vprofit_amount==&quot;&quot;|| isNaN(ncost) || isNaN(nprofit_amount)) {
			profit_amount.value = &quot;&quot;;
			return;
		}
		profit_percent.value = (nprofit_amount / (ncost + nprofit_amount) * 100).toFixed(2);
		charge.value = (ncost + nprofit_amount).toFixed(2);
	}
);

addEvent(
 [quantity, cost, charge, profit_amount, profit_percent],
 &quot;keyup&quot;,
 function(e) {
 var vquantity = quantity.value.trim(); var nquantity = vquantity*1; 
 var vcharge = charge.value.trim(); var ncharge = vcharge*1;
 var vcost = cost.value.trim(); var ncost = vcost*1;
 var vprofit_amount = profit_amount.value.trim(); var nprofit_amount = vprofit_amount*1;
 var vprofit_percent = profit_percent.value.trim(); var nprofit_percent = vprofit_percent*1;
 if(vquantity==&quot;&quot; || vcharge==&quot;&quot; || vcost==&quot;&quot; || vprofit_amount==&quot;&quot; || vprofit_percent==&quot;&quot; || isNaN(nquantity) || isNaN(ncharge) || isNaN(ncost) || isNaN(nprofit_amount) || isNaN(nprofit_percent)) {
 profit_amount.value = profit_percent.value = &quot;&quot;;
 return;
 }
 tax.value = (ncharge * 0.08375).toFixed(2); 
 cost_per_unit.innerHTML = &quot;$&quot; + (ncost / nquantity).toFixed(2) + &quot;/per unit&quot;;
 charge_per_unit.innerHTML = &quot;$&quot; + (ncharge / nquantity).toFixed(2) + &quot;/per unit&quot;;
 subtotal.value = (ncharge + (ncharge * 0.08375)).toFixed(2);
 discount.value = &quot;&quot;
 dcc.innerHTML = &quot;&quot;;
 dt.innerHTML = &quot;&quot;;
 dst.innerHTML = &quot;&quot;;
 dpa.innerHTML = &quot;&quot;;
 dpp.innerHTML = &quot;&quot;;
 
 }
);
addEvent(
 [discount],
 &quot;keyup&quot;,
 function(e) {
 var vcost = cost.value.trim();
 var ncost = vcost*1;
 var vdiscount = discount.value.trim();
 var ndiscount = vdiscount*1/100;
 var vcharge = charge.value.trim();
 var ncharge = vcharge*1;
 var vprofit_amount = profit_amount.value.trim();
 var nprofit_amount = vprofit_amount*1;
 var vquantity = quantity.value.trim();
 var nquantity = vquantity*1;
 var vsubtotal = subtotal.value.trim();
 var nsubtotal = vsubtotal*1;
 off = (ncharge * ndiscount).toFixed(2)
 dcharge = (ncharge - off).toFixed(2)
 dtax = (dcharge * 0.08375).toFixed(2) 
 dsub = (nsubtotal - off).toFixed(2)
 dprof = (dcharge-ncost).toFixed(2)
 dper = (dprof/ncharge*100).toFixed(2)

// tax.value = (tax.value * ndiscount).toFixed(2);

discount_amount.innerHTML = off;
 dcc.innerHTML = &quot;&lt;strong&gt;$&quot;+ dcharge + &quot;&lt;/strong&gt; ($&quot;+ (dcharge / nquantity).toFixed(2) +&quot;/per unit)&quot;;
 dt.innerHTML = &quot;&lt;strong&gt;$&quot;+ dtax + &quot;&lt;/strong&gt;&quot;;
 dst.innerHTML = &quot;&lt;strong&gt;$&quot;+ dsub + &quot;&lt;/strong&gt;&quot;;
 dpa.innerHTML = &quot;&lt;strong&gt;$&quot;+ dprof + &quot;&lt;/strong&gt;&quot;;
 dpp.innerHTML = &quot;&lt;strong&gt;&quot;+ dper + &quot;%&lt;/strong&gt;&quot;;
 
 }
);
</pre>
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Pastable version of Repetitive Calculator Code