Please answer the question and provide formula **Explanation**. I have seen the formula multiple times, but don't understand it. Thank 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%.

One integer is 8 times another. if the product is 72, then find the integers

What are the coordinates of the midpoint of ab? ,1/2) /2,-1) ,-3/2) /2,-2)