transactions during the month: January 3 Sold 20 units on account at a selling price of $15 per unit. January 6 Bought 30 units on account at a cost of $10 per unit. January Sold 30 units on account at a selling price of 16 $15 per unit. January Sold 20 units on account at a selling price of 19 $20 per unit. January Bought 10 units on account at a cost of $10 per 26 unit. January Counted inventory and determined that 160 units 31 were on hand. 3-a. What is the dollar amount of shrinkage that you were able to determine in periodic inventory system? 3-b. What is the dollar amount of shrinkage that you were able to determine in perpetual inventory system? Periodic inventory system Perpetual inventory system Amount of shrinkage