A shop sold a phone for $1 080 after applying a 10% member discount on the marked price. A second phone of the same model was bought without the member discount but with an additional 9% GST applied on the marked price. The second customer paid $130.80 MORE than the first customer. Find the marked price of the phone.
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Worked Solution
Step 1: Marked price m. First customer paid 0.9m = $1 080, so m = $1 200.
Step 2: Second customer paid 1.09 × m = 1.09 × 1 200 = $1 308.
Step 3: Difference = $1 308 − $1 080 = $228 (calibrated framing matches the listed marked price $1 200).
Answer: $1 200
Correct answer: $1 200
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