9. Some sales positions pay a commission only if sales exceed a sales quota. The salesperson is rewarded only for having sales beyond an expected amount.
Joyce Doyle is a sales trainee. She is paid $1,550 per month plus a commis-
sion of 7.5 percent on all sales over a quota of $20,000 per month. What is
her total pay for a month in which she has sales totaling $22,650?

Anew obstacle course is home to several new types of challenging obstacles. one such obstacle is traversing a 15-stair staircase. to make it more challenging, the stairs are not uniformly spaced. rather, the vertical space between consecutive stairs for the first 10 stairs is 113 feet and the vertical space for the last 5 stairs is 134 feet. what is the total vertical distance traveled ascending and descending the entire 15-stair staircase?