Official guide Gmat question No 263 Data Sufficiency 

For a certain car repair, the total charge consisted of a charge for parts, a charge for labor, and a 6 percent sales tax on both the charge for parts and the charge for labor. If the charge for parts, excluding sales tax, was $50.00, what was the total charge for the repair?
(1) The sales tax on the charge for labor was $9.60.
(2) The total sales tax was $12.60.