A man saves 10% of his monthly salary. If an account of dearness of things he is to increase his monthly expenses by 10%, he is only able to save Rs. 200 per month. What is his monthly salary?  Choose the most appropriate option:
A) rs . 22,000
B) rs . 21,000
C) rs . 20,000
D) rs . 23,000
E) rs . 24,000

Rationale: "income = rs . 100 expenditure = rs . 90 savings = rs . 10 present expenditure 90 + 90 * ( 10 / 100 ) = rs . 99 present savings = 100 – 99 = rs . 1 if savings is rs . 1 , salary = rs . 100 if savings is rs . 200 , salary = 100 / 1 * 200 = 20000 answer : c"
Answer: C