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Rani gives 0.025 part of her salary as pocket money to her son guo every month. guo spends 0.8 part of his pocket money ans saves the rest. if he saves RS

277.50 in 3 months, how much does rani earn in a month


Let Rani's salary be Rs. 1000a. (a not equal to 0) in 1 month.
Son gets = Rs. 1000a × 25/1000 = Rs 25a.
Son saves = Rs (1- 8/10) × 25a = Rs 5a.
By the problem,
1000a = 18,500.
Rani earns Rs. 18,500 in one month.  (Ans.)

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how did you get 1000a?
You just assume the salary to be Rs. 1000a. You can also take it as Rs. x. Rs 1000a has been assumed for convenience of calculation.
Raina earns 18,500 in a month.
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