Sir,
Please help my son to solve this problem.

Mr.Hari spends 66% of his salary on his family. 20% of the remaining he gives to a trust for charity and is left with Rs12240. What is the total salary of Mr.Hari and how much amount does he give to the trust??
Answers are Rs45,000 and Rs.3060

Thank you

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Solution

Let the Salary = x
Spent on family = 0.66x
Remaining = x - 0.66x = 0.34x
Given to the trust = 0.20 * 0.34x = 0.068 x

What is left = 0.80(0.34x) = 0.272x

0.272x = 12, 240 Rs
x = Rs 45, 000

Given to trust = 0.068x = Rs 3, 060

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