How do the totals for Bubble Sort (Exercise 4.7) compare with those for Selection Sort (Exercise 4.3)? How many comparisons would you estimate for Bubble Sort with n = 20? Can we say exactly how many exchanges there will be with n = 20?

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?