What is 9/45 divided by 7/42

What aspects of lines have to be diffrent

Do, h = (7, 9) (14, 18) the scale factor is

Acomputer store buys a computer system at a cost of $370.80. the selling price was first at $ 618, but then the store advertised a 20 % markdown on the system. answer parts a and b. a. find the current sale price.