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calculating numbers with a periodic increase

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Oct 03.2008

I am still having trouble getting the script right. If I am trying to calculate the sum of a stream of payment that start at $15 each but then increase to $30 after 10 payments are made what am I doing wrong? I know that the total should come out to 450 (i < 20).

Here is the script;

<script type=”text/javascript”>
<!–
var supp = 15

for(i = 0; i < 20; i++){

a = supp*i
n = supp+a

if (a > (supp*10))
{
a = ((supp*2)*i)
n = supp+a
}
}
document.write(n);
</script>

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JavaScript

6 Comments(s) ↴

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@gil_davisOct 03.2008 — <i>
</i>&lt;script type="text/javascript"&gt;
var supp = 15
n = 0
for(i=0; i&lt;20; i++)
{if (i == 10) {supp = 30}
n = n + supp}
document.write(n);
&lt;/script&gt;
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@CharlesBauthorOct 03.2008 — Thank you, your help is much appreciated?
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@CharlesBauthorOct 03.2008 — Gil, if I want the payments to increase by 15 after every 10 payments what type of loop would that be? for or while? I think I have to divide the number of times the loop runs by 10 and then make a separate for statement to do each calculation and sum the total of each. Does that make sense?
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@gil_davisOct 06.2008 — &lt;script type="text/javascript"&gt;
var supp = 0 // the first time will still be 15
n = 0
nPmt = 50; // change for how many payments you want
for(i=0; i&lt;nPmt; i++)
{if ((i &amp;#37; 10) == 0) {supp = supp + 15}
n = n + supp}
document.write(n);
&lt;/script&gt;
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@CharlesBauthorOct 06.2008 — Thank you for your help! I don't have a chance to review the code right now as I am at work, but tonight I will. Again I really appreciate this help ?
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@CharlesBauthorOct 07.2008 — Thank you Gil, the code works great!!
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