Santino bought a book for $23.54. The price of the book was $22. What was the sales-tax rate?

We first find value of tax in dollars.

The difference between the two prices is: 23. 54 - 22 = 1.54

Therefore the sales tax in dollars is 1.54

The tax % will be (amount of tax / original cost price) * 100

(1.54 / 22) * 100 → (0.07) * 100 = 7

So the tax rate is 7%

We can double check the answer.

7 % of 22 → (7/100) * 22 → 0.07 * 22 = 1.54

22 + 1.54 = 23.54