Can someone please help:/

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%.

In the diagram, the ratio of ab to ae is (1/2) . what is the ratio of the length of to the length of ?

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?