A stackable CD rack holds 25 cds and costs 4 charlie has a collection of 150 cds how much will it cost him to buy enough racks to hold all of his cds?

Charlie has 150 CDs and each stackable CD rack holds 25 CDs. To find out how many racks he needs, divide 150 by 25, which equals 6 racks. Since each rack costs $4, the total cost for 6 racks is 6 multiplied by 4, equaling $24.