./4 LUFT HELT On January 1, 2021, Casselberry Retailers had inventory of 548,700. On December 31, 2021. total ventory on and was $65.200 Casselberry reported the following account balances on December 31 Freight in $3.100 Purchases 500.000 Purchase returns and allowances 1,600 7.000 Purchase discounts Sales 840.200 Sales discounts 5.100 Sales returns and allowances 10.400 a) Calculate Casselberry Retailers 2021 gross profit Gross profit