Peter wants to buy a coat that costs $87 at full price. The coat is now on sale for 40% off Part A: Explain how Peter can use the fact that 10% of $87 is $8.70 to find the amount he will save on the coat

Part B: Use the same method to find the amount Peter would save on a $64 coat that is on sale for 40% off

Step-by-step explanation:

Hello!

        Part A            

Peter can use the fact that 10% of 87 is 8.70 to find the amount he would save because 40% is just 4 times bigger than 10% so he can take 8.70 from to total of the coat 4 times to find out how much it cost.

        Part B            

Using the same method we know that 10% of 64 is 6.40 so we subtract that from the price of the coat 4 times to find out how much it cost

64 - 6.40 = 57.6

57.6 - 6.40 = 51.2

51.2 - 6.40 = 44.8

44.8 - 6.40 - 38.4

The price of the coat is $38.4

Hope this helps!