Bunuel wrote:
A bakery opened yesterday with its daily supply of 40 dozen rolls. Half of the rolls were sold by noon, and 80 percent of the remaining rolls were sold between noon and closing time. How many dozen rolls had not been sold when the bakery closed yesterday?
(A) 1
(B) 2
(C) 3
(D) 4
(E) 5
The bakery began the day with 40 dozen rolls. Half of the rolls were sold by noon, so we know by noon we had 40 x ½ = 20 dozen rolls sold. It follows that there were 20 dozen rolls remaining between noon and closing time.
We are next given that 80%
of the remaining rolls were sold between noon and closing time. Since 80% were sold,
20% were left. This means:
rolls left when the bakery closed = 0.2 x 20 = 4 dozen rolls
Answer: D
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