You are the manager of a clothing store and have just purchased 100 dress shirts for $\$ 20.00$ each. After 1 month of selling the shirts at the regular price, you plan to have a sale giving $40 \%$ off the original selling price. However, you still want to make a profit of $\$ 4$ on each shirt
at the sale price. What should you price the shirts at initially to ensure this? If, instead of $40 \%$ off at the sale, you give $50 \%$ off, by how much is your profit reduced?