If raisins cost $1.80 a pound. find 1/10 the chefs total cost for 100 pounds of raisins

1.80 per lb for 100 lbs = 1.80 * 100 = 180

1/10 * 180 = 180/10 = $  18 <==

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