Question
Anita spends 75% of her monthly salary and receives a
commission of 5% on her salary every month. If her annual saving is Rs. 129600, find the commission she gets every month. [Monthly income = salary + commission]Solution
Let salary = Rs. x Commission = 5% of x = 0.05x Expenses = 75% of x = 0.75x Monthly income = x + 0.05x = 1.05x Monthly saving = 1.05x – 0.75x = 0.30x Annual saving = 12 × 0.30x = 3.6x Given: Annual saving = Rs. 129600 
Hence, Commission = 5% of 36000 = 1800 per month
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