Use reasoning to lead to the answer of the following question:
John raises butterflies. He has 4 jars of 10 caterpillars each. 40% of them fail to become butterflies, but the rest become caterpillars.  He sells the butterflies for $3 each. How much money does he make?

72
He has 4 * 10 = 40 caterpillars.

40 *.

4 = 16 fail to form.

That means he has 40 - 16 = 24 butterflies.

So he makes 24 * 3 = $72.

.

So, the final answer is 72