Answer:
$289.41
Step-by-step explanation:
As we know that the total amount 'A' that is due to pay on loan for a certain interest 'r', principal 'p' and number of times the interest is compounded per year 'n' is:

Since, in our case, p = $43,000, r = 2.4% =
= 0.024, n = 12 (monthly), and t = 20 years.
Therefore,

$
For monthly payment for 20 years,

$ ≈ $289.41
Hence, the amount of his monthly payment lasting for 20 years at APR of 2.4% on a loan of $43,000 compounded monthly will be $289.41.