Sunny’s Surf Shop sold 20 surfboards last week. This week, they will sell 320 percent as many. How many surfboards will Sunny’s sell this week?

Question

16

64

160

640

A.

B.

C.

D.

Answer 1

320 is bigger than 100 so we know the answer is more than 20 surfboards. More than 3 times as much:

320/100*20=320/5=64. 64 is more than 3 times 20 so we know the answer is probably right, and it is! Answer B.