The discussion clarifies the difference between calculating 20% of a price and determining a price that is 20% off. The original poster mistakenly computed 20% of the original price instead of applying the discount. To find the new price after a 20% discount, one must calculate 20% of the original price and subtract that amount from the original price. The conversation emphasizes the importance of understanding the terms "of" and "off" in this context, as they significantly change the calculation. The thread concludes with a note to wait for the original poster's return for further clarification.