There are 5 red and 3 black balls in a bag. Find the probability of drawing a black ball.

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?

Amira is painting a rectangular banner 2 1/4 yards wide. the banner will have a blue background. amira has enough paint to cover 1 1/2 square yards of the wall. the school colors are blue and yellow, so amira wants to add yellow rectangles on the left and right sides of the blue rectangle. the yellow rectangles will each be 3/4 yards wide and the same height as the blue rectangle. what will be the total area of the two yellow rectangles?

Percent increase and decrease. original number: 45 new number: 18