A sells a refrigerator priced Rs. 42,000. He gives a discount of 12% on the first Rs. 25,000 and 5% on the next Rs. 15,000. How much discount can he afford on the remaining Rs. 2,000 if he is to get as much as when 10% discount is allowed on the total
1). 12.5%
2). 6%
3). 22.5%
4). 25%

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