= O RATIOS, PROPORTIONS, AND PERCENTS Finding simple interest without a calculator Lena deposits $800 into an account that pays simple interest at a rate of 5% per year. How much interest will she be paid in the first 4 years? ​

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?