Complete the following table for the firm below which is selling its product in a perfectly competitive market and hiring labor in a perfectly competitive labor market.

MARGINAL
WORKERS TOTAL MARGINAL PRODUCT REVENUE
HIRED PRODUCT PRODUCT PRICE PRODUCT

1 12 ______ $10 ______
2 22 ______ 10 ______
3 30 ______ 10 ______
4 36 ______ 10 ______
5 40 ______ 10 ______
6 42 ______ 10 ______
a) How many workers will the firm hire at a wage of:
$20 _______
$30 _______
$40 _______
b) EXPLAIN.