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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
Answer: D
Source: Official Guide
(A) 1
(B) 2
(C) 3
(D) 4
(E) 5
Answer: D
Source: Official Guide
