I need help with those MATH problems. i know the answers and i just need to be explained step by step. answers. 13) 14.5% 14) 6.00% 15) 5.15% 16) 21.2% my teacher used rhe formula Un=U1r^n. please I need step by step to get to those answers.

13 An investor has purchased rare medals for $10000 and hopes to sell them 3 years later for $15000 What must the annual percentage increase in the value of the medals be, in order for the investor's target to be reached? 14 | deposited 65000 into an account that compounds interest monthly. 3. years later the account has balance E6165. What annual rate of interest did the account pay? 15 -A young couple invests their savings of $9000 in an account where the interest is compounded quarterly. Three years later the account balance is $10493. What interest rate has been paid? 16 A new sports car devalues from $68500 to 126380 over 4 years. Find the annual rate of depreciation