Calculating weighted average

I’m using the below AS but it just doesn’t seem to be working…

Looks like the actionscript referencing is OK it just seems to be getting stuck on the / in the result_product calculation.

Let me know if this needs further explanation. I’d have no problem posting the source fla

function onCalculate() {
one = Number(number_one);
two = Number(number_two);
three = Number(number_three);
four = Number(number_four);
ten = Number(number_ten);
eleven = Number(number_eleven);
twelve = Number(number_twelve);
thirteen = Number(number_thirteen);
result_sum = one + two + three + four;
result_product = ((one * ten) + (two * twelve) + (three * thirteen) + (four * fourteen)) / (one + two + three + four);
}