A store purchased 100 notebooks at a price of $4.00 each. It sold 40 notebooks at the regular selling price, 40 at a markdown price of $8.00, and the remaining at cost. a. What was the regular selling price of the notebooks if the store maintained a net markup rate of 60% based on total sales? $6.00 b. What will be the rate of markup on the regular selling price? 50.00 %