Answer
Find out the loss as a percentage of the cost price.
To prove
As given
Tina bought her car for $6000 and later sold it for $4500.
i.e Cost price = $6000
Selling price = $4500
Loss = Cost price - Selling price
= $6000 - $ 4500
= $1500
Loss percentage formula

Put all the values in the formula

= 25%
Therefore the loss percentage is 25% .