Since the cost per month per child is $87, we can first start by multiplying this cost by 2, since he has 2 daughters.

Now, the $174 cost is the cost per month, but taking both daughters into account.
To get the full budget, we can now multiply by the number of months, which is 12:

So, the total budget is $2088. Since the question ask to not include the dollar sign, it is just 2088.