Answer:
k = 4
Explanation:
if direct variation exists,
input * k = output
here, number of baskets = input and cost = output
3 * k = 12
5 * k = 20
6 * k = 24
8 * k = 32
15 * k = 60
does this always work for one k?
let's try it out
3 * k = 12
divide both sides by 3 to solve for k
k = 4
5 * k = 20
divide both sides by 5 to solve for k
k = 4
6 * k = 24
divide both sides by 6 to solve for k
k = 4
8 * k = 32
divide both sides by 8 to solve for k
k = 4
15 * k = 60
divide both sides by 15 to solve for k
k = 4
as k = 4 no matter what, there is a direct variation with k = 4