Question

Sam bought brushes for $8, a palette for $5, and oil paints for $15. He paid $29.82 in all. What sales-tax rate did Sam pay?

Answer 1

in perecentages??

Answer 2

OK

Sam's total purchase is 8 + 5 + 15 = 28

He paid 29.82. So, algebraically,

28 * (1+ r) = 29.82
28 + 28r = 29.82
28r = 1.82
r = 1.82/28
r = .065

or 6.5% sales tax.

Prove it:

28 * (1 + .065) = 29.82??
28 x 1.065 = 29.82??
29.82 = 29.82 YES!!

Hope that helps.