Verified by Ajay Kumar
The price of a shirt is increased by 20% and then again increased by 10%. What is the net percentage increase in price?
30%
32%
31%
33%
Answer: B
Let the original price be ₹100. After a 20% increase, the price becomes ₹120. After another 10% increase, it becomes \(120\times1.10=132\)₹. The net increase is ₹32 on ₹100, so the net percentage increase is 32%. Trick: Successive increase \(=a+b+\frac{ab}{100}=20+10+\frac{20\times10}{100}=32\%\).
एक शर्ट की कीमत में 20% की वृद्धि की जाती है और फिर 10% की वृद्धि की जाती है। कीमत में शुद्ध प्रतिशत वृद्धि क्या है?
30%
32%
31%
33%
उत्तर: B
मूल कीमत ₹100 मानें। 20% वृद्धि के बाद कीमत ₹120 होगी। फिर 10% वृद्धि के बाद कीमत \(120\\times1.10=132\)₹ होगी। कुल वृद्धि ₹32 है, इसलिए शुद्ध प्रतिशत वृद्धि 32% है। ट्रिक: क्रमिक वृद्धि \(=a+b+\frac{ab}{100}=20+10+\frac{20\times10}{100}=32\%\)।
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