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A man buys an article for Rs 25.80 and sells it for Rs. 27.30. Find his gain percent.

Gain = Selling Price - Cost PriceGain = 27.30 - 25.80 = Rs 1.50

Gain% = (Gain/Cost Price) x100=(1.50/25.80) x 100 = 5.8%

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Find cost price when Selling price is Rs 57 and loss = 5%.

Cost Price = 100 x Selling Price/(100-Loss%) Cost Price = 100 x 57/95 = 60

A vendor bought toffies at 6 for a Rupee. How many for a Rupee must he sell to gain 20%?

Cost Price of 1 Toffee = Rs 1/6Gain = 20% of Cost Price ==> (20/100) x 1/6 = 1/30Selling Price = Cost Price + Gain ==> 1/6+1/30 = 1/5Number of toffees for Rs 1/5 = 1Number of toffees for Re 1 = 5He should sell 5 toffies for 1 Rupee to gain a profit of 20%

Ajay sells an article that costs him Rs. 400/- to Vijay at a profit of 25%. Vijay sells it to Sanjay making a profit of 10% on the amount Vijay paid to Ajay. How much does Sanjay pay?

Selling Price for Ajay = Cost Price + Gain==> 400+(25/100) x 400 = 500.This is cost price for Vijay. Selling price for Vijay = 500 + 10% of 500==> 500 +(10/100) x 500 = 550.So the amount Sanjay pays is 550.