The value of Maggie's car decreased by 25% since last year, when she bought it. If the car is now worth $11,000.00, how much was the car worth when she bought it?

Consider u = {x|x is a negative real number}which is an empty set? o {x|x eu and x has a negative cube root}o {x|x eu and x has a negative square root}{x|x eu and x is equal to the product of a positive number and -1}{x|x eu and x is equal to the sum of one negative and one positive number?