Work out the value of y and give a reason for your answer

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%.

Acylinder has volume 45π and radius 3. what is it’s height?

Could someone with number 1 and 2