What is the solution

Change negative exponents to positive, then solve

Solve for b. ab + c= d b= a + old ob=allc-ch b= (d-c/a

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?