There are 50 goldfish in the pond. Each goldfish eats 1.5 ounces of food per day. 20% of the goldfish need to eat special food that costs $3 an ounce. How much does it cost to feed these fish?
There are 10 fish who need the special food because 50 x .2 = <<50*.2=10>>10
These fish eat 15 ounces a day because 10 x 1.5 = <<10*1.5=15>>15
This food costs $45 because 15 x 3 = <<15*3=45>>45
#### 45