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The price of milk was first increased by 10% and then decreased by 20%. What is the net percentage change in final price of milk?
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7.5 10 12 15 |
12 |
Formulae of net effect: x + y + \(\frac{xy }{100 }\) 10 - 20 + \(\frac{-200 }{100 }\) = -10 - 2 = -12% i.e. decrease by 12% |
