Let x be the hourly rate. Since he works 20 hours that week, the hourly wages are given by 20x. We add to that his commission, which is 16% of the $1500 in sales, or 0.16(1500). This totals to 515:
20x + 0.16(1500) = 515 20x + 240 = 515
Subtract 240 from both sides: 20x + 240 - 240 = 515 - 240 20x = 275
Divide both sides by 20: 20x/20 = 275/20 x = 13.75.
Surface area is the area that is on the outside of a figure and will be used when you have to cover something, but a volume is an area inside an object and is used in finding the amount someone can hold within something else.
