What is 9x9x9x9x9x9x9x9x9x9x9

Which of the following expressions are equivalent ?

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%.

What percent of the circle below is shaded?