The three angles of a triangle always have to add up to 180degrees. If one of the angles is obtuse(which means it is bigger than 90degrees), the other two angles will both always be less than 90 degrees.
The multiplier for the 18% decrease would be 1-18 = 0.82
The multiplier for the 19% increase would be 1.19
The single multiplier would be: 0.82 x 1.19 = 0.9758
Step-by-step explanation:
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The better deal is 3 for $11