math
posted by cant figure this out :( .
What is the size of the payments that must be deposited at the beginning of each 6month period in an account that pays 6.6%, compounded semiannually, so that the account will have a future value of $140,000 at the end of 17 years?

Accumulation value of an annuity (due)
Sn=P*((1+i)^n1)/d
where Pthe size of payments, n=17*2=34,
i=0.066/2=0.033, d=i/(i+1)=0.032
140000=P*63.1024733
P=2218.61