Give the step-by-step reasoning process and then the final answer. 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 = 10. These fish eat 15 ounces a day because 10 x 1.5 = 15. This food costs $45 because 15 x 3 = 45.
The final answer: 45.