<human>:  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 $3 each. How much money does he make?
<bot>: How many caterpillars does John have? ** He has 4*10=<<4*10=40>>40 caterpillars.
How many caterpillars fail to form? ** 40*.4=<<40*.4=16>>16 fail to form.
How many butterflies does John have? ** That means he has 40-16=<<40-16=24>>24 butterflies.
How much money does John make? ** So he makes 24*3=$<<24*3=72>>72.
#### 72