A $2.56 pack of playing cards costs $2.72 after sales tax is figured in. What is the sales tax percentage?
Write your answer as a decimal using a percent sign (%). For example, 0.5% or 12.7%.
The difference in price before and after tax is $2.72 - $2.56 = $0.16.
Let x be the sales tax percentage.
In equation form, we can write:
($2.56)(1 + x) = $2.72.
Simplifying the equation, we get:
2.56 + 2.56x = 2.72
2.56x = 2.72 - 2.56
2.56x = 0.16
x = 0.16 / 2.56
x = 0.0625 = 6.25%
Therefore, the sales tax percentage is 6.25%. Answer: \boxed{6.25}.