sergio bought 5 new binders for $4.50 each. he also bought 20 pencils six pencils cost $3.60. what is the total amount sergio spent on the binders and pencils?

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?