If Angel bought a $600 phone in San Antonio, he would pay 8.25% sales tax, which is:
0.0825 x 600 = $49.50
If Angel bought the same $600 phone in Toronto, he would pay 13% sales tax, which is:
0.13 x 600 = $78.00
The difference in sales tax between San Antonio and Toronto for the $600 phone is:
$78.00 - $49.50 = $28.50
Therefore, Angel would pay $28.50 more in sales tax if he bought the phone in Toronto instead of San Antonio.