Worker salary

The worker had a salary of CZK 18,000. During the year, his salary was increased by a quarter. He earned a total of CZK 247,500 for the whole year. From which month was his salary increased?

Correct answer:

n =  6

Step-by-step explanation:

a=18000 Kc b=a+a/4=18000+18000/4=22500 Kc r=247500 Kc  a (n1)+(12(n1)) b=r 18000 (n1)+(12(n1)) 22500=247500  4500n=27000  n=450027000=6  n=6   Verifying Solution:  r2=a 5+b (125)=18000 5+22500 (125)=247500

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