Final answer:
The original price of the LCD TV is $400.
Step-by-step explanation:
To find the original price of the LCD TV, we need to determine what the 30% discount represents in dollar amount. Let's call the original price 'x.' The sales price of $280 is equal to 70% of the original price, so we can set up an equation: 0.70x = 280. Dividing both sides of the equation by 0.70 gives us the original price: x = $400. Therefore, the correct answer is A. $400.