Answer:
the original list price of the grinder was $147
Explanation:
If the sale price is 20% off the original price, then the sale price is 100% - 20% = 80% of the original price. We can set up the equation:
Sale price = 0.8 * original price
We know the sale price is $117.60, so we can substitute and solve for the original price:
117.60 = 0.8 * original price
original price = 117.60 / 0.8
original price = 147
Therefore, the original list price of the grinder was $147.