I honestly still think it is 18. I understand where you are coming from but if VCAA wants to prevent students to write 18.26 then 'nearest' shouldn't be included in the question (Just by asking how many months, in which months or after how many months etc or give your answer in whole numbers). It can be the same thing as payments when VCAA ask you to find monthly payments and round it to nearest cent or dollar, so what if you round it down? Wouldn't that also be inaccurate from what you said? Rounded answer never was suppose to be accurate.
But this question however is somewhat dodgy. I found 3 sources, 1 of them said 18 the other 19 and the last one didn't even bother giving an answer to the question but did so to the rest.
MAV is quite a credible source imo, and they said 19, and I don't expect you to trust this, but my teacher is legit an examiner, and we discussed this question, and i'm fairly certian it is 19. The 'nearest' thing does not matter in this instance, because the 18.26th payment, just as the 18.99th payment do not
exist based on the context of this question and the scope of the FM study design. Hopefully it wont be this ambiguous on the exam, as ik there is a lot of debate on this. The way you are interpreting it, however, is flawed because you are assuming 18.26 is close to 18 therefore 18 is the answer, but in doing this you are validating the existence of an 18.26th payment when in fact there are only two payments of interest the 18th (where the loan is not fully paid off) and the 19th. I would completly agree with you if it said how many equal payments will hugo make, as in that case there would be 18 equalpayments and a final smaller payment.