The broker's charge is called brokerage.
(i) When stock is purchased, brokerage is added to the cost price.
(ii) When stock is sold, brokerage is subtracted from the selling price.
The face value of a share always remains the same.
The market value of a share changes from time to time.
Dividend is always paid on the face value of a share.
Number of shares held by a person
(Total Investment/Investment in 1 share) = (Total Income/Income in 1 share) = (Total Face Value/ Face of 1 value)