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Find the selling price.
a. CP=₹ 2500, Gain $ = 5\frac{1}{2}$%
b. CP=₹ 2850, loss $=15$%
Given :
a. Cost Price = 2500₹ ; Gain $ = 5\frac{1}{2}$%
b. Cost Price = 2850₹ , Loss = 15 %
To find :
We have to find the selling price.
Solution :
a.) Cost Price = 2500₹
Gain $ = 5\frac{1}{2}$%  
Profit $= \frac{profit \ percentage}{100} \times Cost price$
Profit $= \frac{5 \frac{1}{2}}{100} \times 2500$
$ = \frac{\frac{5\times2 + 1}{2}}{100} \times 2500$
$ = \frac{\frac{11}{2}}{100} \times 2500$
$ = \frac{11}{200} \times 2500$
Profit $ = 137.5 ₹$
Selling price $= Cost price + Profit$
Selling price $ = 2500 + 137.5$
Selling price = 2637.5₹
Selling price is 2637.5 ₹
b). Cost Price = 2850₹
Loss = 15 %
Loss amount $=\frac{Loss \ percentage}{100} \times Cos price$
Loss amount $=\frac{15}{100} \times 2850 $
Loss $ = 427.5 ₹$
Selling price $=Cost price - loss$
Selling price $ = 2850 - 427.5$
Selling price $=2422.5 ₹$
Selling price is 2422.5₹.