Mary’s salary is reduced by 10%. By what percentage must her new salary be increased in order to gain her old salary?
(A) 137⁄9 %
(B) 194⁄9 %
(C) 100/9 %
(D) 110⁄9 %
Answer: (C)
Explanation: Let her old salary be Rs 100. Then, her new salary = 100 – 10 = Rs 90.
So, to gain her old salary, her new salary must be increased by Rs 10. Therefore, the required percentage = (10⁄90) × 100% = 100/9 %.
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