A man’s monthly salary increased from Rs. 42,000 to Rs. 57,000. What is the percentage (rounded off to 1 decimal place) increase in his monthly salary?

Correct option is A

Given:
Original salary = Rs. 42,000
New salary = Rs. 57,000
Formula Used:
​$$\text{Percentage Increase} = \left(\dfrac{\text{Increase}}{\text{Original Salary}}\right) \times 100$$​​
Solution:
Increase = 57,000 − 42,000 = 15,000
Percentage Increase =  $$\left(\dfrac{15000}{42000}\right) \times 100 = 35.714\%$$​​
Rounded to 1 decimal place = 35.7%
The percentage increase in his monthly salary is 35.7%.