Price of a mobile is first increased by 20% and later decreased by 25%. What is the net percentage change in final price of the mobile?एक मोबाइल की कीमत पहले 20% बढ़ाई जाती है और बाद में 25% घटाई जाती है। मोबाइल की अंतिम कीमत में शुद्ध प्रतिशत परिवर्तन कितना है?
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Correct answer: A. 10%
Explanation
Take the original price as ₹100. After a 20% rise it becomes 100 × 1.20 = ₹120; after a 25% fall it becomes 120 × 0.75 = ₹90. The net change is 90 − 100 = −10, i.e. a net decrease of 10%.मूल कीमत ₹100 मानिए। 20% वृद्धि के बाद = 100 × 1.20 = ₹120; फिर 25% कमी के बाद = 120 × 0.75 = ₹90। शुद्ध परिवर्तन = 90 − 100 = −10, अर्थात् 10% की शुद्ध कमी।More Mathematical Reasoning and Aptitude questions
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