Tom's statement shows a previous balance of $2452.64 a payment of $160 a new transactions totaling $138 what is his new balance if his apr is 15.6%

Last month, leonhard euler's watch kiosk at the mall had total sales of $9,489. merchandise totaling $225 was returned. the goods that were sold cost leonhard euler's $5,481. operating expenses for the moth were $992. what was the gross profit on sales?