b)

Total Physical Product (TPP) = Average Physical Product (APP) * Units of inputs (Q).

Average Physical Product (APP) = TPP/Q

Marginal Physical Product (MPP) = TPPn– TPPn_-1

• APP (u=1) = 100/1 = 100

• TPP (u=2) = 140+100 = 240 (as MPP = TPPn– TPPn_-1)

• APP (u=2) = 240/2 = 120

• TPP (u=3) = 140*3 = 420

• MPP (u=3) = 420-240 = 180

• APP (u=4) = 480/4 = 120

• MPP(u=4) = 480-420 = 60