Here’s and example of a SMART MATH problem for PERCENTAGES.
Problem
Every month M saves 1.67% of his salary of $6000. In how many months will M save $6000?
- 60 months
- 6 months
- 52 months
- 48 months
- 12 months
The Usual Method
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In a month M saves 1.67% of $6000. i.e. = $100.
Hence to save $6000, M will have to save for 60 months.
(Ans: 1)
Estimated Time to arrive at the answer = 45 seconds.
Using Technique
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Note that 1.67% = (
,
). Thus to save $6000, i.e 100% of the salary, M will have to save for 60 months (
, he saves 10% of the salary in 6 months, so for 100%, he will take 60 months).
(Ans: 1)
Estimated Time to arrive at the answer = 15 seconds.
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