The total temperature change if it decreased and then increased would be a 28% decrease.
Assuming the temperature started at 10°C, the change is:
= 10 x (1 - 60%)
= 4°C
Then another change of:
= 4 x (1 + 80%)
= 7.2°C
Change is:
= (10 - 7.2) / 10
= 28% decrease
Missing part of question:
How did the temperature change if
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