You have borrowed $$35,000$ of student loans at $2\mathrm{.}50\%$ APR with monthly payments over $10$ years.

Calculate the exact amount of the last payment to the penny.

$330\mathrm{.}62($with margin: $0)$

there is a positive balance of $$0\mathrm{.}68$ after the theoretical last payment so add that on to the level payment of $$329\mathrm{.}94$

Where is the $0\mathrm{.}68$ coming from?