eaakbari wrote:What is the FASTEST method to solve the question given below.
A man spends 70% of his salary on food expenses, 40% of the rest on traveling expenses, 90% of the rest on house rent and was finally left with $3600. How much did he spend on traveling expenses?
A. 24000
B. 18000
C. 25000
D. 22000
E. 20000
To determine the ratio, let the salary = 1000.
Food = .7(1000) = 700.
Remainder = 1000-700 = 300.
Travel = .4(300) = 120.
Remainder = 300-120 = 180.
Since 90% of the remainder is spent on rent, the amount left after rent = .1(180) = 18.
Travel : amount left = 120:18.
Since the ACTUAL amount left = 3600, and 3600/18 = 200, the multiplier for the ratio is 200:
Travel : amount left = 200(120:18) = 24000:3600.
Thus, travel = 24000.
The correct answer is
A.
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