please answer the questions

51. How much interest will you have to pay for a credit card bal- 68. If the ance of $554 that is I month overdue, if a 20% annual rate is owed charged? 74. A married couple has $15,000 toward the purts to buy, a down house. For the house that the couple wants to buy, a down payment of $20,000 is required. How long will the money to $20,000 ? (Round up to the next-higher quarter if not exact.) 52. How long will it take $5,000 to grow to $7,000 if it is invested at 6% compounded quarterly? 87. What annual nominal rate compounded monthly has the same annual percentage yield as 7% compounded continuously