Which expression could be used to determine the cost of a $50 video game after a 20 percent discount?

The price of a video game is now 50 dollars after the 20% discount.The question is what is the expression to be able to solve that amount before the 20% discount.=> 100% - 20% = 80%=> 50 is the 80% => 80% = .80Expression = .80 = 50, where x is the unknown number that we  need to know.
=> .80 = 50 => .80x / .80 = 50 / .80=> x = 62.5 dollars is the original price of the said video game on sale.

The correct one is c.

X> -2 is the simplified version.