Help pls please again and again anf again

Adepartment store purchases screen-printed t-shirts at a cost of $5 per shirt. they mark up the price 150% (making the selling price 250% of the store's purchase price) and put them on the sales floor. every month that a t-shirt doesn't sell, the store reduces the selling price by 25%.

Which expression is equivalent to the expression shown?

Janet drove 300 miles in 4.5 hours. write an equation to find the rate at which she was traveling