Paul's monthly payment in year 4 is $1,050.
Data and Calculations:
Mortgage loan = $300,000
Mortgage term = 10 years
5/1 interest-only ARM rate = 3%
Interest margin = 2%
Interest caps = 2/6
Initial monthly payment = $750
The index adjustment is as follows:
Year 1 2.50% (initial year)
Year 2 2.75%
Year 3 3.25%
Year 4 3.50%
Year 5 3.75%
Year 6 3.00%
Year 7 2.80%
Year 8 5.00%
Thus, Paul's monthly payment in year 4 is $1,050 ($750/2.50% x 3.50%).
Learn more about monthly payment on a mortgage loan with a balloon payment here: https://brainly.com/question/8930826