A bakery opened with its daily supply of 40 dozen rolls. Half of the rolls were sold by noon, and 60% of the remaining rolls were sold between noon and closing time. How many dozen rolls were left unsold?
Show Hint
- 6
- 8
- 10
- 12
The Correct Option is B
Solution and Explanation
Half of 40 dozen were sold by noon: \(\frac{40}{2} = 20\) dozen sold.
Step 2: Find the rolls remaining after noon.
Remaining \(= 40 - 20 = 20\) dozen.
Step 3: Find the rolls sold between noon and closing.
60% of the remaining 20 dozen were sold: \(0.6 \times 20 = 12\) dozen sold.
Step 4: Find the rolls left unsold at closing.
Unsold \(= 20 - 12 = 8\) dozen.
Step 5: Rule out the other options.
Option 1 (6), option 3 (10) and option 4 (12) do not match this two-stage calculation of 40 dozen. Only 8 dozen is correct.
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