Question
Suman spends 60% of her salary and gets an additional
allowance of 15% every month. If her annual savings are Rs. 193200, find her monthly allowance. [Monthly income = salary + allowance]Solution
Let salary = Rs. x Allowance = 0.15x Monthly income = 1.15x Annual income = 12 × 1.15x = 13.8x Savings = 40% of 13.8x = 0.40 × 13.8x = 5.52x 5.52x = 193200 ⇒ x = 193200 / 5.52 = Rs. 35000 Allowance = 0.15 × 35000 = Rs. 5250
Mahalanobis model is –
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