A price tag at NTUC FairPrice shows a decimal number. Three clues are given: - The ones digit is 3. - The tenths digit is twice the hundredths digit. - The sum of the ones digit, the tenths digit, and the hundredths digit is 9. A shopper buys 4 of this item. What is the total cost?
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Worked Solution
Step 1: Let the hundredths digit = h.
Step 2: Since the tenths digit is twice the hundredths digit, tenths digit = 2h.
Step 3: Apply the digit-sum condition: ones + tenths + hundredths = 9
3 + 2h + h = 9
3h = 6
h = 2
Step 4: Tenths digit = 2 × 2 = 4, hundredths digit = 2.
The price shown on the tag is $3.42.
Step 5: Total cost for 4 items = 4 × $3.42 = $13.68.
Answer: $13.68
Correct answer: $13.68
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