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A shopkeeper normally allows a discount of 10% on the marked price of each article. During a sale season, he decides to give two more discounts, the first being at a rate of 50% of the original and the second at a rate of 40% of the first. What is the percentage rate of the equivalent single discount (correct up to two decimal places)?
एक दुकानदार आमतौर पर प्रत्येक वस्तु के अंकित मूल्य पर 10% की छूट देता है | बिक्री के मौसम में, वह दो अतिरिक्त छूट देने का निर्णय लेता है जिसमें एक की दर प्रारंभिक छूट का 50% तथा दूसरी छूट की दर पहली छूट का 40% है | समतुल्य एकल छूट की प्रतिशत दर ( दो दशमलव स्थानों तक सही ) ज्ञात करें|

A

11.25

B

16.21

C

14.85

D

13.27

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