Question

Ming paid $1.05 in sales tax on a purchase of $20. What is the sales tax rate

Answer 1

5.25%

Explanation:

this question is asking '1.05 is what percent of 20'?

you can use the proportion: is/of = percent/100

the 'is' = 1.05

the 'of' = 20

'what percent' = x/100

1.05/20 = x/100

cross-multiply to get:

20x = 105

x = 5.25