The cost of one dress shirt is $20
So the total cost of 3 dress shirts is $20 x 3 = $60
The tax on the total purchase is 10% of $60, which is $60 x 10% = $6
Therefore, the total amount that John paid is $60 + $6 = $66
#### 66
The answer is: 66
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
If John purchases 3 dress shirts, each priced at $20, and has to pay a 10% tax on the total purchase, what is the total amount that he paid?

### Answer:
