Sales and average operating assets for Wyeth Company and Genesis Company are given below:

SalesAverage Operating Assets

Wyeth Company $22,600 $14,500

Genesis Company $56,500 $12,600

What is the margin that each company will have to earn in order to generate a return on investment of 15%?

a. 1.6 % and 4%.

b. 56% and 100%.

c. 10% and 3%.

d. 5% and 26%.