Step-by-step explanation:
The cost of the computer = $300
The sale percentage of the computer = 20%
20% ( 300) = $60
The current price of the computer = 300 - 60 = $240
5% of salex tax on the computer = 5% (240) = 12
The total price = current price of the computer + sales tax
= 240 + 12
= $252