The unlabeled part of the right angle is complementary to 68 degrees, so 22 degrees. y is supplementary to 78 degrees, so 102 degrees. z as the third angle in the small triangle is 180 less than the sum of the other two,
z = 180 - 22 - 102
Answer: 56 degrees
The third one because its the only one decreasing
the discount is 22.5 * .2 =
round 22.5 to 20
20 *.2
Choice B