ANSWER:
$400
STEP-BY-STEP EXPLANATION:
The original value would be the sum between the discount percentage (20%) and the discount value ($320).
Therefore, we calculate it as follows:
[tex]x=x\cdot\frac{20}{100}+320[/tex]Let x be the original value, we solve for x:
[tex]\begin{gathered} x=0.2x+320 \\ x-0.2x=320 \\ 0.8x=320 \\ x=\frac{320}{0.8} \\ x=\text{\$}400 \end{gathered}[/tex]The original fare is $400