A historically useful generalization supported by Arrhenius' equation is that, for many common chemical reactions at room temperature, the reaction rate doublesfor every 10 degree Celsius(kelvin) increase in temperature.
here
kt+10/ kt =x
10 degrre rise so
answer is 2
10 to 100 that is 100-10 =90
that is 9 times of 10 degree
so 2^9=512