<human>:  James takes 20 units per semester at community college. If each unit costs $50 how much does he pay for 2 semesters?
<bot>: How much does James pay for each semester? ** He pays 20*50=$<<20*50=1000>>1000 per semester
How much does James pay for 2 semesters? ** So he pays 1000*2=$<<1000*2=2000>>2000
#### 2000