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
D
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A bakery opened yesterday
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boomgoesthegmat
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We start with 40.
We sell half, so we're left with 20.
We then sell 80% of the rest, or 80% of 20, or 16.
So we're left with 20 - 16 => 4.
We sell half, so we're left with 20.
We then sell 80% of the rest, or 80% of 20, or 16.
So we're left with 20 - 16 => 4.
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Scott@TargetTestPrep
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We see that 1/2 x 40 = 20 dozen rolls were sold by noon and 0.8 x 20 = 16 dozen rolls were sold between noon and closing time. Thus we have 40 - 20 - 16 = 4 dozen rolls left unsold.boomgoesthegmat 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
Answer: D
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