Answer:
Explanation:
First of all, subtract 0.12 from 2.79. If you do that you assume that the 2.79 includes the tax, so you want to base purchase price.
2.79 - 0.12 = 2.67
The tax is 12 cents on 2.67
% = 0.12/2.67 * 100 = 0.0449 * 100 = 4.49%.
To the nearest % it would be 4%