
We are given:
Total rolls = 40 dozen = 40 × 12 = 480 rolls
Half sold by noon → 480 ÷ 2 = 240 rolls sold by noon
Remaining = 480 − 240 = 240 rolls
From the remaining 240 rolls:
60% sold between noon and closing → 60% of 240 = (60/100) × 240 = 144 rolls
Rolls left unsold = 240 − 144 = 96 rolls
Now convert back to dozens:
96 ÷ 12 = 8 dozen
✅ Final Answer:
8 dozen rolls were left unsold.
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