A dishonest shop keeper professes to sell his goods at cost price and cheats while buying and selling to the extent of 20% and 10% respectively, by using false weight. Find the percentage of profit earned by him.
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Step-by-step explanation:
Let the C.P. = Rs.100 per kg, =Rs.100 per 1000 gm=Rs.1 per 10 gm
The shopkeeper uses 800 gm weight as a 1 kg weight so his gain = Cost of 200 gm = Rs.20
∴ His gain% =
80/20 ×100= 25%
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