During the first year, the number of students in class X of a school increased by 12%and during the second year, it reduced by 9%. At the end of the second year, thenumber of students was 1274. What was the number of students in class X at thebeginning of the first year?

Correct option is A

Given:

The number of students at the end of the second year = 1274

Increase in the first year = 12%

Decrease in the second year = 9% 

Solution: 

Let the number of students at present = x 

Then, 

​$$x \times \frac{112}{100}\times \frac{91}{100} = 1274 \\ \ \\ x = 1274 \times \frac{100}{112}\times \frac{100}{91} \\ \ \\ x = 1250$$​​