=if(A1<=10,A1*1.1,if(A1>=1,A1*1.05,A1))
This will give you an increase of the required percentage. If you just want 5% or 10% of the value then change to 0.1 and 0.05.
It will also only give one or the other. You didn't specify what to do if neither condition is met so it will just display the contents of A1.