Monty Company sells two types of pumps. One is large and is for commercial use. The other is smaller and is used in residential swimming pools. The following inventory data is available for the month of March. Price per Unit Units Total Residential Pumps Inventory at Feb. 28 220 $ 380 $ 83,600 Purchases: 490 March 10 March 20 March 30 $460 $225,400 $490 $196,000 $520 $156,000 Sales: March 15 March 25 Inventory at March 31 510 $ 550 $275,000 $ 580 $232,000 Commercial Pumps Inventory at Feb. 28 590 $780 $460,200 Purchases: 590 March 3 March 12 March 21 $ 920 $542,800 $930 $269,700 $1,010 $505,000 Sales: March 18 March 29 Inventory at March 31 500 880 $1,080 $950,400 $1,120 $660,800