The monthly repayment on the further advance (portable loan) would be approx. $xxxx, and the additional advance (if we extend the term to 25 years) would be approx. $xxxx. This gives a total entitlement of $xxxx with monthly repayments of approx. $xxxx.
Links
[1] https://clik.dva.gov.au/user/login?destination=node/18380%23comment-form