To find the answer, first multiply 37 by 20 to get how much money she got from sales which is $740. Now find 1/4 of that by dividing $740 by 4 to get $185. that is how much she will be using to buy cds. Now, to get the amount she will be putting away, subtract $185 from $740. The answer to your problem is $560 ( hope this explains it )