He has 4*10=<<4*10=40>>40 caterpillars.

40*.4=<<40*.4=16>>16 fail to form.

That means he has 40-16=<<40-16=24>>24 butterflies.

So he makes 24*3=$<<24*3=72>>72.

# Answer

72
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?
Answer:
Let's think step by step.

user
72
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?
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