Simple Interest chap 7 Business Math [contemporary business mathematics with Canadian applications] Hummelbrunner.

Question 1 The Woof Gang Pet Supplies Store has three past-due payments of $1,600 due nine months ago, $1,750 due four months ago, and $800 due two months ago. What single payment is required today to pay off these three past payments if interest is 12%? Question 2 Marty McFly has scheduled payments of $950 due five months ago, $1,500 due six months from today, and $875 due one year from today. Marty wants to consolidate all three payments into one single payment today that will replace the three original payments. The interest rate is 8.5%. How much is the replacement payment