<human>:  Mark hires a singer for 3 hours at $15 an hour. He then tips the singer 20%. How much did he pay?
<bot>: How much did the singer cost? ** The cost was 15*3=$<<15*3=45>>45
How much did the singer tip? ** So the tip was 45*.2=$<<45*.2=9>>9
How much did he pay? ** So in total, he paid 45+9=$<<45+9=54>>54
#### 54