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Selling price of a cellphone is increased by 20%. For this sale is decreased by 30%. Find the effect of total sales?

Correct Answer: 16%

Explanation:

Let cost of each cell phone = Rs.100 & Sale = 100 phones.


Money receipt = Rs.(100 x 100) = Rs.10,000


New cost per cellphone = Rs.120 and New sale = 70 phones


New Money Receipt = Rs.(70 x 120) = Rs.8400


Then the effect of sales = decrease in money receipt = 


1600 10000   x   100   =   16 %.


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