5. Mark wants to buy X shares of Gillette stock. Gillette stock has a bid price of 100 and a bid-ask spread of 1. Mark can purchase the stock using either Johnson Brokers or Cooper Stock Brokerage. Johnson charges a flat commission of 150 without regard to the number of shares purchased. Cooper charges a commission that is 0.5% of the purchase price. Determine the values of X for which Mark should use Cooper