a). A client of yours wishes to sell short 1000 shares of LMN Company Ltd. at its current market price of $2.00. What is the minimum margin that is required to be put up by the client? (Show your calculations).

b). Assume that later on, the price of LMN's shares rises to $3.50. What is the margin, if any, that is required to be put up by the cleint? (Show your calculations).

c). What is the required margin, if any, if the price of LMN shares drops to $1.50? (Show your calculations).