Year 1: Sales revenue in $ million is 300, Operating profit in $ millions is 60. Year 2: Sales revenue in $ miliion is 400, Operating profit in $ million is 100. Year 3: Sales revenue in $ million is 500, Operating profit in $ millions is 90.

what is the total factor productivity for year 2?

a. 1.250

b. 1.333

c. 1.220

d. none of the above