First, we have to put 13.1 billion into numbers.
13,000,000,000.1
Then, we divide.
13,000,000,000.1÷12=1,083,333,333.3416666666666667
You might want to round that.
So if you roud it, the answer is right below.
1,083,333,333.3
So when the answer is rounded, the answer is 1,083,333,333.3.
You got your answer. Hope it works!