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Price of tea has increased by 20% but I ...

Price of tea has increased by 20% but I have decided to increase my expenditure towards tea by 15% only. By what percentage should I reduce my consumption (correct to one place of decimal) in order to be able to maintain the same level of expense towards tea ?
चाय की कीमत 20% से बढ़ गयी है लेकिन मैंने चाय पर अपना व्यय केवल 15% बढ़ाने का निर्णय लिया है| चाय पर समान स्तर के व्यय को बनाए रखने के लिए मुझे अपनी खपत में कितने प्रतिशत की कमी ( एक दशमलव स्थान तक सही ) करनी चाहिए ?

A

5.4

B

4.2

C

5.6

D

4.8

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