Beginning 7325

Since the beginning of last year, Mr. Pilný had a monthly salary of CZK 10,520. From which month (1-12) was his salary increased by CZK 1,400 when he earned CZK 1,332,40 in a year?

Correct answer:

n =  8

Step-by-step explanation:

12·10520 + 1400·(13-n) = 133240

1400n = 11200

n = 11200/1400 = 8

n = 8

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