Question

The Lemon company produces 40% of its cars at
plant A and the remainder at plant B. Of all cars
produced at plant A, 20% do not have a spare tire,
while 30% of the cars produced at B do not have a
spare tire. A
Lemon
is purchased, and it happens
to have a spare tire. What is the probability that it
was produced at plant B?
(a) 32/74
(b) 1/2
(c) 42/74
(d) .7
(e) .8
(f) none of the above