A shop offers a discount of 20% on all items. After the discount, GST of 9% is charged on the discounted price. The final price of a microwave (after discount and GST) is $392. Find the ORIGINAL price of the microwave (before discount).
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Worked Solution
Step 1: Let the original price = x. After 20% discount, price = 0.8x.
Step 2: After 9% GST on the discounted price: 0.8x × 1.09 = 0.872x.
Step 3: 0.872x = $392 → x = $392 ÷ 0.872 ≈ $450.
Answer: $450
Correct answer: $450
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