In Year 1,an Economy Used 200 Worker Hours to Produce

In year 1,an economy used 200 worker hours to produce 500 units of output.In year 2,the economy used 240 worker hours to produce 660 units of output.If year 1 is the base year,the productivity index for year 2 is:

A) .10
B) 1.10
C) 1.25
D) 1.32