Answer : the amount of sales tax charged is directly proportional to the amount of the purchase. anna pays $3.90 sales tax on a $60 purchase. what is the rate of the sales tax? what would the sales tax be on a $340 purchase?

6.5%

$22.10

Step-by-step explanation:

percent = part/whole * 100%

percent = $3.90/$60 * 100%

percent = 6.5%

The percent rate of the sales tax is 6.5%.

part = percent * whole

6.5% of $340 =

= 6.5% * $340

= 0.065 * $340

= $22.10

The tax on $340 is $22.10