December salary

The official had a monthly salary of 8,500 euros. During the year, they increased his salary by 15%, so he received a total of 112,200 euros for a year. From which month did they raise his salary? (1 = January .... 12 = December)

Correct answer:

n =  5

Step-by-step explanation:

r=100%+15%=1+10015=1.15 s1=8500 eur s2=s1 r=8500 1.15=9775 eur  s1 (n1)+s2 (12(n1))=112200 8500 (n1)+9775 (12(n1))=112200  1275n=6375  n=12756375=5  n=5



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