Find the best deal
$57 for 4 dvds
$31 for 2 dvds
$75 for 5 dvds

To check the best deal you have to divide and least value tells you best deal !

so 57/4 = 14.25 is the least value of all so it is the best deal !!

In the first triangle 80+20+p=180 (since sum of all angles of a triangle is 180)so p= 80also in second triangle 55+45+q=180 (since sum of all angles of a triangle is 180)so q=80so we can conclude that p=80 degrees q=80 degrees so p=q=80 degreeshence option b is correct