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?

Result

p =  20 %

#### Solution:

$a = 2 \cdot \ 60+40 = 160 \ \\ b = a+40 = 160+40 = 200 \ \\ p = 100 \cdot \ (b-a)/b = 100 \cdot \ (200-160)/200 = 20 = 20 \%$

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