The answer is $1071.43.
Step-by-step explanation
First, you need to know that with regards to this problem, loan and interest sums at $450,000 ($100,000+$340,000).
Next, divide it by 35 in order to find how much the payments will be on a per year basis.
$450,000/35 = $12857.14
Finally, divide it by 12 to find the monthly payments.
$12857.14/12 = $1071.43