For this case we have the total price given of 3.80 and we want to analyze the 15% off and we can create the following proportion:
[tex]\frac{3.80}{100}=\frac{x}{100-15}[/tex]And solving for x we got:
[tex]x=85\cdot\frac{3.80}{100}=3.23[/tex]And the final price would be 3.23$ after the discount.
