7. A certain number of articles are bought at 3 for 150 and all of them are sold at 4 for 180. Find the loss or gain as percent.
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Step-by-step explanation:
FIRST WE NEED TO FIND FOR ONE ARTICLE
= 150 ÷3 =50
THE PRICE OF ONE ARTICLE IS 50
THE ORIGINAL PRICE OF 4 ARTICLE IS 4×50
=200
SELLING PRICE =180
LOSS =C.P-S.P
200-180 =20
LOSS PERCENTAGE
LOSS/C.P×100
20/200×100
=10%
LOSS =10%
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