Job task

After two hours and 40 minutes, the job is finished. Compared to last year, we were 40 minutes faster.
What is the percentage increase to our performance?

Correct answer:

p =  20 %

Step-by-step explanation:

a=2 60+40=160 min Δ=40 min b=a+Δ=160+40=200 min  p=100 Δb=100 40200=20%

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