Which formula gives the area of a rectangle?

a = 1/2 bh

a = 2(b + h)

a = bh

a = b + h

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.