Surface area is the area of all the sides added up. If you were to unfold all the areas and make it flat (2-D), area is

.
Volume would be cubed because it's 3-D
A straight line = 180 degrees.
Subtract the 2 known angles from 180:
180 - 112 - 38 = 30 degrees
The best thing to do us to find the difference between $150 and $100. The difference is $50. You've then got to divide $150/$50 and thus gives you 3.333, therefore, the percentage decrease is 33%
Hope this helps :)
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