A shoe store bought 225 pairs of shoes for $15750. Twenty-five pairs were sold at a markup of 150% of cost and 175 pairs at a markup of 75% of cost; 10 pairs were sold during a clearance sale for $80 each and the remaining shoes were disposed of at 20% below cost. Assume all pairs of shoes had the same cost. a. What was the cost of shoes?
b. What was the amount of markup realized on the purchase? 
c. What was the percent markup based on selling price?​