A store sells memory cards for $25 each. A) The markup for each memory card is 25. How much did the store pay for 50 memory cards? B) The store offers a discount when a customer buys 2 or more memory cards. A customer pays $47.50 for two memory cards. What is the percent of discount? C) How much does a customer pay for three memory cards if the store increases the percent of discount in part b by 2%? Please help! (explination as well please!) :)​