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Cost of packing of mangoes is 40% cost...

Cost of packing of mangoes is` 40%` cost of fresh mangoes. Price of mangoes is increased by `30 % ` but the cost of packing of mangoes is decreased by `50%` . If cost of packed mangoes is equal to sum of cost of fresh mangoes and packing of mangoes then, find what is the percentage change in the cost of packed mangoes.

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The correct Answer is:
`(15)/(7)%`
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The cost of packaging of the mangoes is 40% the cost of fresh mangoes themselves.The cost of mangoes increased by 30% but the cost of packaging decreases by 50%, then the percentage change of the cost of packed mangoes,if the cost of packed mangoes is equal to the cost of the cost of fresh mangoes and cost of packaging :

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