Aa total product schedule of Pieca a'Pi, a producer of pizza in a nearby college town. Suppose workers are paid $12 per hour and the price per pizza is $10. The value of marginal product of the fourth worker is___per hour.
quanity of labor 0 Total product 0, ql=1 tp=10, ql=2 tp=17, ql=3 tl=22, ql=4 tp=24, ql=5 tp=25
a.$20
b.$220
c.$24
d.$12
e.$240