Salary raise

The monthly salary was 620 Eur. During the year it was raised to 727 Eur. Calculate the month from salary was increased that employee earned 7547 Eur during the whole year.

Result

Number of the month:  12

Solution:

620(n1)+727(12n+1)=7547 n=12620(n-1)+727(12-n+1)=7547 \ \\ n = 12



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