[機經] math jj 260

[kaichuan (貓晟)]

Of vehicles( car+truck), 48% are 4 door cars. 80% of the cars are 4 door.

Whats the proportion of cars that is not 4 door to the population of vehicle?


The answer is 12%


看了解答不太懂   有人可以說明一下嗎?

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