A temperature question

[JABBARA]

Hi everybody,

I am sure there is scienific explanation for this:

Today the temperature is 20 degrees Celcius, and 2 weeks later it is expected to be two times warmer; around 40 degrees Celcius.

Now answer this:
Today the temperature is 0 degrees Celcius, and 2 weeks later it is expected to be two times warmer; around how many degrees?

Thanks