The original price of computer is $ 1040
Solution:
Given that, Mason used a 30% coupon to buy a new computer
After the discount, the cost of the computer was $728
To find: original price of computer
From given question,
price after discount = $ 728
discount = 30 % of original price
Let "x" be the original price of computer
price after discount = original price - discount price

Let us solve the above expression for "x"

Thus original price of computer is $ 1040