Because the multiple of 3 is characterized by the fact that the sum of the numbers on each digit can be divisible by 3, and because it is necessary to find out at least how many copies to take away, after taking away,

There should be more than 490 copies left, that is, the number of 100 yuan is 4 and the number of 10 yuan is 9.

Because 4+9= 13

13+9=22, and 22 is not divisible by 3.

13+8=2 1, 2 1 is divisible by 3.

So at least 500-498=2 (Ben)

A: At least two books will be taken away.