Question

clara is a salesperson. she sold a breifcase for $66 and earned 20% commision. how much commision did clara earn?

Answer 1

Clara earned $13.20 because 20% of 66 is 13.20

Answer 2

She earned $13.20 in commision here's why....
If you multiply the $66 by the 20% or .20 
66X.20=13.20
you get 13.20 as your answer.