1. A shopkeeper has a DVD which he bought for $12. He decided that he wanted to have a profit of 10%. He finds 10% of this $12 price and adds it on to make the selling price.
What price will he have to sell it for so that his profit will be 10% of $12?
(But the DVD didn't sell so he reduce the price by 10%)
2. Please reduce the selling price you found (in question 1) by 10%. What is the new selling price?
(His teenage assistance suggest another method for earning money)
3. First take a 10% discount on the buying price. Then, take this number, find 10% and add this on to the number itself.
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1) here sp = $12 + 10/100×12
sp = 12 +1.2 =$13.2
2) now again reducing 10% on $13.2 the new sp will be
sp = 13.2 -10/100×13.2 =13.2 - 1.32 =$ 11.88
3) 12 -10/100×12=12 -1.2 = 10.8
again adfing 10 on this number the new sp will be
10.8 + 10/100×10.8= %12.6
sp = 12 +1.2 =$13.2
2) now again reducing 10% on $13.2 the new sp will be
sp = 13.2 -10/100×13.2 =13.2 - 1.32 =$ 11.88
3) 12 -10/100×12=12 -1.2 = 10.8
again adfing 10 on this number the new sp will be
10.8 + 10/100×10.8= %12.6
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