0–4 orient: Read the catalogue's final and ask whether a tax-exclusive label can be a final model price. 4–9 source read: State explicitly that the two invented parts are assumed fully taxable; actual product classification is outside the exercise. 9–16 model: Calculate 10% × $75 = $7.50, then A $82.50; B is supplied as $86 GST-inclusive. Use the percent mat to keep exclusive/inclusive bases distinct. 16–27 route: Learners mark up the card, lay price chips or dictate a corrected comparison. 27–32 audit: A peer checks the $3.50 listed-price difference and asks where delivery would belong. 32–35 exit: Replace $75 final with a sentence that names the assumption and known total.
Development draft · local review needed
Day 18 · Excluding GST changes “final”Year 11 Inquiry · T1 W3–4 · Day 18 lesson
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Year 11 / Integrated / Term 1 / Weeks 03 04
Part of the full two-week lesson sequence. Check the pack guide and taught point before teaching.
Open for this lesson: Pack guide · Fresh learner checks · Aids and text routes.
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