Final answer:
To find the original price of a computer that is sold for $1200 after a 20% discount, divide the sale price by 0.8. The original price is found to be $1500.
Step-by-step explanation:
To determine the original price of the computer before the discount, we should consider that the final price represents 80% of the original price (100% - 20% discount). The final price after the discount is given as $1200, which is 80% of the original price. To find the original price, we divide the final price by 80% (or 0.8).
Original Price = Final Price / 0.8 = $1200 / 0.8 = $1500.
Therefore, the original price of the computer was $1500.