err? looping formula error?

[JustTrying2GetBy]

code:

const interest_rate := 0.115 const payment := 8600 var mortgage : int := 85000 var b : int := 0 var interest, balance : real put "Year", " " : 10, "Interest", " " : 10, "Balance" loop     interest := mortgage * interest_rate     balance := mortgage + interest - payment     b := b + 1     put b, " " : 13, "$ ", interest, " " : 11, "$ ", balance     exit when b = 15 end loop

too tired to think...something wrong with my formula or sumthing...(the balance is soupposed to increase with every year of payment). first interest increasement shows up 0........starting mortgage-$85,000 annual intrest rate - 11.5%, payments are $8600/yr. Intrest is addded before payments are deducted.

how do i fix problem

[Delos]

You need to change the value of the mortgage! It's no use calculating the interest if you're not going to add it to the mortgage.