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Rockwood bakery has many different products for sale. suppose that 70% of all customers order donuts, 50% order cinnamon rolls, and 40% order both. if a customer is randomly selected, what is the probability that she ordered neither donuts nor cinnamon rolls?

Respuesta :

20% of them order neither.

The total percentage of donuts ordered is 70%; this includes the 40% that order both.  This leaves 70-40 = 30% that order only donuts.

The total percentage of cinnamon rolls ordered is 50%; this includes the 40% that order both.  This leaves 50-40 = 10% that order only donuts.  

This leaves 100-30-40-10 = 20% that do not order either.

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