Cost Price: It is the price at which an article is purchased
Selling Price: It is the price at which an article is sold.
Profit and Gain: If SP > CP, It means seller is said to have a profit or gain
Loss: If SP< CP, then seller is said to incurred loss
3.Gain %= (GainX100)/CP
4.Loss%= (Loss X100)/CP
5. SP= CP(100+Gain%)/100
9.If two similar product is sold, one at a gain of x% and teh other at a loss of x%, then the seller always incurs loss.
10.If a trader sells at cost price but uses false weight then
Gain %= 100 x error/(True Value-Error)