Formula for profit and loss % -

gain % = [ X / Y -1 ] * 100 %

where X is cost price and Y is selling price.

Example-

The cost price of '33' articles is equal to the selling price of '28' articles.Find the gain percent .

Putting the value in formula-

% = [ X / Y - 1] * 100 %

% = [33 / 28 - 1 ] * 100 %

% = 5 / 28 * 100 %

% = 0.17857142857143 * 100 %

% = 17.857142857143%

Gain % will Be 17.857142857143%.