Really stuck on this problem, any help is greatly appreciated A man invests $4000 in an account that pays 8.5% interest per year, compounded

Really stuck on this problem, any help is greatly appreciated

$40008.5%

(a) Find the amount after 2 years? (Round your answer to the nearest cent.)

(b) How long will it take for the investment to double? (Round your answer to two decimal places.)

 yr