Answer:
1.08 times (108% of) the starting value.
Step-by-step explanation:
Let's say the original temperature was 100. (if it wasn't, you just have to scale it accordingly: was it 50, you take half of the result, and so on). After the first "step" the temperature dropped by 60%. And 60% of 100 is conveniently 60. At this point, it increased by 80%. Now, 80% of 60 is 48. (every 10 units you take 8, so 8x6). At this point we increase 60 by this value to get 108. We started at a temperature of 100, so the new temperature is 108/100 = 1.08 times the original one - or in percentage, 108%
