The temperature does not change after the percentage increase and decrease.
Percentage can be described as a fraction out of an amount that is usually expressed as a number out of hundred.
Assume the initial temperature is 10.
Temperature after the 50% increase : (1 + 0.5) x 10 = 15
Temperature after the 33 1/3% decrease : (1 - 0.333) x 15 = 10.00
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