Anumber x multiplied by 2/5 is 3/20

How do i do this activity, is appreciated

Organic apples are on special for $1.50 per pound. does total cost vary inversely or directly with the number of pounds purchased? find the cost of 3.4 pounds of apples. a. inversely: $5.10 b. directly; $5.10 c. inversely: $2.27 d. directly; $2.27

Credit card a offers an introductory apr of 3.4% for the first three months and standard apr of 15.7% thereafter,