For 0\le n\le 10, find a formula for p_n, the payment in year n on a loan of 100000 d

For http://webwork.math.ucdavis.edu/webw...232cc9f731.png, find a formula for http://webwork.math.ucdavis.edu/webw...854aa9a391.png, the payment in year http://webwork.math.ucdavis.edu/webw...70877535c1.png on a loan of 100000 dollars. Interest is 5 percent per year, compounded annually, and payments are made at the end of each year for 10 years. Each payment is 10000 dollars plus the interest on the amount of money outstanding.

i got 10000 + (100000-10000n)(.05)^(n+1), but it's wrong