# Two fresh formative checks · learner copy · public

These check cases are new relative to Cards A–G, but the [teacher-targeted key](teacher/KEY-AND-NEXT.md) is also publicly accessible. They are **practice evidence, not secure exams or QCAA assessment instruments**. If prior access matters, a teacher should change the invented numbers/context. Save a first independent response before discussion. Usual large text, exact read-aloud, calculator, tactile quantity cards, AAC/sign, typed work and exact-word scribing are available; record any mathematical hint separately from access. All wages, prices and returns are fictional. No real employment, tax or financial decision follows.

## Check A · Day 15 · different payment periods

A made-up adult design role states a gross annual model amount of **$70,200**, converted for this exercise using **52 weeks, 26 fortnights and 12 months**. Separately, a fictional one-shift brief offers **$190 base plus 5% of $900 eligible sales**. No deduction, contract, minimum, cap or actual work condition is supplied.

1. Find the model gross weekly, fortnightly and monthly salary amounts. Name the period attached to each.
2. Find the commission **dollars** and the base-plus-commission **shift** total. Identify the percentage base.
3. Explain why comparing the one-shift total directly with a monthly salary amount would be misleading. Name one missing real-work condition.
4. Show one independent arithmetic check or estimate for each situation.

## Check B · Day 20 · fully taxable print and simple interest

Assume a fictional print supply is **fully taxable at the stated 10% GST practice rate**. Its listed price is **$135 excluding GST**. A separate invented fully taxable item has a listed price of **$99 including GST**. Independently, a fictional simple-interest calculation has principal **$1,800**, annual rate **4%**, term **1.5 years**, with no compounding, fees or tax. None of these are real offers or tax classifications.

1. Find GST in dollars and the inclusive price of the $135 item. Show which amount is the percentage base.
2. For the $99 inclusive item, find the exclusive base and GST component; check they add back to $99.
3. Use `I=Pin` to find the interest and final model amount on $1,800 for 1.5 years. State the time unit and one assumption.
4. Write two short source-bound cautions: one about using the GST exercise on a real product, and one about mistaking a simple-interest model for an actual return.