Answer
${{\$}} 420$
Work Step by Step
After reducing $ 100\%$ (of something) by $ 20\%$, we are left with $ 80\%$ (of something)
If that something is $x$= initial price, then the amount is
$ 80\%$ (of $ x $) = $0.8x $
Given: $0.8x={{\$}} 336$
We divide the equation with 0.8
$ x={{\$}} 420$
