Multiple choice

A shopkeeper marks the price of an article at Rs. 80. What will be the selling price, if he allows two successive discounts at 5 % each? एक दुकानदार एक वस्तु का मूल्य 80 रू. अंकित करता है। तदनुसार, यदि वह उसे प्रत्येक 5% की दो क्रमिक छूटें देकर बेचे, तो उसका विक्रय मूल्य कितना होगा?

  1. Rs. 72

  2. Rs. 85

  3. Rs. 7.2

  4. Rs. 72.2
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Marked price = Rs. 80. After first 5% discount: 80 × 0.95 = Rs. 76. After second 5% discount: 76 × 0.95 = Rs. 72.20. For successive discounts, multiply the factors: (1 - 0.05)(1 - 0.05) = 0.9025, so 80 × 0.9025 = 72.20. Don't make the error of simply subtracting 10% from 80.

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