Successive percentages spent from the remaining income: salary, a share or the savings

This type of question, asked 4 times: 24 Jul 2023 S3, 24 Jul 2023 S4, 26 Jul 2023 S3, 24 Sep 2024 S2. All 4 questions below, oldest first.

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Question 1
24 Jul 2023 S3
70 $A person spends 25% of his income on goods of daily uses. Furthermore, he spends 18% of the rest on house rent and 16% of the rest on travel. After that, only ₹861 is left with him. What is his salary?$
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Question 2
24 Jul 2023 S4
72 $Rima spends 35% of her monthly income on food articles and 15% of the remaining on clothes. She saves 40% of the remaining income. If her monthly salary is ₹27,500, how much does she save (in ₹) every month?$
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Question 3
26 Jul 2023 S3
70 $A father gives 8% of his monthly income to both his sons as pocket money. The elder son gets 85% of the total amount given to both the sons. He spend 90% of the amount and saves ₹17. What is the monthly income of father?$
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Question 4
24 Sep 2024 S2
65 $Vipul spends 30% of his monthly income on rent, 60% of the remaining on groceries, and 40% of the remaining on others. If he saves ₹ 7056 in a month, then how much (in ₹) does he spend on groceries?$
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Question 1