What is 2.7(7.8) show work i don't understand this question you!

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 of the following is the best first step in solving the equation below? 4+2㏒³x=17

What is the ratio fraction form of 25: 9