9514 1404 393
Answer:
up 26%
Explanation:
The first change multiplied the temperature by 1+5% = 1.05.
The second change multiplied that result by 1+20% = 1.20.
Then the end result was multiplication by ...
1.05 × 1.20 = 1.26 = 1 + 26%
The temperature increased by 26%.