The formula is A=p (1+r)^t A future value 7300 P present value 1500 R interest rate 0.0675 T time? 7300=1500 (1+0.0675)^t Solve for t Divide both sides by 1500 7300/1500=1.0675^t Take the log for both sides Log (7300/1500)=t×log (1.0675) Divide both sides by log (1.0675) T=log(7,300÷1,500)÷log(1.0675) T=24.2 years round your answer to get 24 years