bond with 10 years left to maturity

This is a two part question, I understood the first part but now I am at a standstill. Here is the question: We are asked what is the price of the bond if the yield is to be 9% per annum compounded annually?

Using the formula given: P = A(1+i)^n

10,000 = A*(1+.09)^15

We solve for A: 10,000/(1+.09)^15 = $2,745.38

Now the question asks, when the bond has 10 years left to maturity, it is offered for sale at $3855.43. Estimate the yeild on the bond if it is then purchased and held to maturity. I took the equation 10,000/(1+.09)^5 = 6,499.313863 to see where the bond would be if there was ten years left, but I can't see how this helps me. Please take a look at this and let me know what the next step is.

Thankx,

Keith