Question
A person gets an increment of x% on his monthly salary.
Before increment, he use to spend 3x/2% of his income and saves the rest. His new expenditure is (x – 10)% more than his previous expenditure. Ratio between the New Savings and Old Savings is 31:20. Find the value of x, x is not a fraction?Solution
Let, the monthly salary before increment = 100 units 
According to the question, 
Since, x cannot be in fractions, therefore, x = 40 Hence, option c) is the correct answer.
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