試題詳解

53. Over a year, Brendan sold an average of 12 umbrellas per day on rainy days, and an average of 3 umbrellas per day on clear days. If the weather was rainy one day in five, and this was not a leap year, what was Brendan’s average daily umbrella sales for the year?
(A) 4.8
(B) 5.2
(C) 6.75
(D) 7.3