Answer:
Roger says that 10% of a number will always be less than 25% of any other number.
Lets say the number are 20 and 50.
When it is correct:
10% of 20 =

25% of 50 =

We can see that 10% of 20 is less than 25% of 50.
When it is not correct:
10% of 50 =

25% of 20 =
We can see that the answer is equal here.
So, this claim is not correct that 10% of a number will always be less than 25% of any other number. It can be greater also.