which explains how to determine 40% of 50?

A. find 10% of 50 by dividing 50 by 10. Then multiply the result by 4.

B. find 10% of 50 by dividing 50 by 10. Then multiply the result by 40.

C. find 50% of 40 by dividing 40 by 2. Then multiply the result by 4.

D. find 50% of 40 by dividing 40 by. Then multiply the result by 40.