Question

An item that sells for $145.99 has a sales tax of 10.22

Find a mathematical model that gives the amount of sales tax y in terms of the retail price x

Use the model to find the sales tax on a purchase that has a retail price x

Answer 1

I assume you mean $10.22

So the rate is 10.22/145.99 = .07 or 7%

y = .07x