Question

Chen donates $15$ percent of his current salary to charity. If his pay is increased by $10$ percent and he still continues to donate $15$ percent of the salary, by what percentage do his charity contributions increase?

• A. 5
• B. 10
• C. 15
• D. 20

Answer 1

Answer: (B)

10

Let the salary of Chen is Rs $100$

He donate $15\%$ to charity the he donate Rs $15$

If his salary increase $10\%$ the his new salary is $110$

Now he donate $15\%$ to charity then he donate $=110\times \frac{15}{100}=Rs.16.5$

His contribution increase $=16.5-15=Rs.1.5$

Increase %=$\frac{1.5}{15}\times 100=10$ $\%$