John buys 3 dress shirts.  They sell for $20 each.  He also has to pay 10% tax on everything.  How much did he pay in total?
The shirts cost 3*$20=$<<3*20=60>>60 before tax
The tax cost $60*.1=$<<60*.1=6>>6
So in total they paid $60+$6=$<<60+6=66>>66
#### 66