Answer:
A. Labor productivity = 12 titles /(4*8)
                  = 12 /32
                  0.375 hrs per unit
b. labor productivity = 20 / 16
                 = 1.25 hrs per unit
c. multi-factor productivity = output/ input
                      = 12 /( 640 +200)
                      = 0.0143
d. multi-factor productivity = Â output/ input
                      = 20/ (320+400)
                      = 0.2778
Explanation:
labour =640 = 4*8*20
labour = 320 = 2*8*20