Solve for the answer.
Let x=10

4x + 12=

(A) 0.52
(B) 5.2
(C) 52

Boris needs to buy plastic spoons. brand a has a box 42 spoons for $2.37. brand b has a box of 72 spoons for $3.57. find the unit price for each brand. then state which brand is the better buy based on the unit price. round your answer to the nearest cent.