Arecipe calls for 4 cups of flour. lauren wants to make 20% more servings than the recipe makes. which expression represents how many cups of flour lauren should use?

a.1/5*4
b.4/5*4
c.6/5*4
d.9/5*4

C. 6/5 * 4

6/5 = 1.20 where .20 represents the 20% increase in serving.

1.20 * 4 = 4.8 is the total cups of flour needed to increase serving by 20%

4 is the 100% ; the desired increase is 20%; therefore: 100% + 20% = 120% based on 4 cups. So, 120% ÷ 100% = 1.2 * 4 = 4.80 cups