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How did the tempruature change?
First it increased by 5%, and then it increased by 20%
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Let T be the initial temperature.
Then after first increase the temperature becomes T*(1+0.05) = 1.05T.
After the second increase, the temperature becomes 1.05T*(1+0.2)T = 1.05*1.2T = 1.26T.
The final increase is 26%, comparing to initial temperature.
Solved.
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If you want to see many other similar (and different) solved problems, look into the lesson
- Percentage problems on chains of discounts
in this site.