the peak of Mt. johnson is 19,360 feet above sea level. The top of Mt. Harrison is 23,350 feet above sea level. round each height to the nearest thousand to estimate the difference in elevation of these two peaks.

The salesperson earns a 5% commission on the first $5,000 she has in sales. the salesperson earns a 7.5% commission on the amount of her sales that are greater than $5,000. this month the sales person had $8,000 in sales. what amount of commission, in dollars, did she earn?