Coolant flush question?

I just came from our local autoshop that specialize on German cars. They quoted me $150 for coolant flush which is drain and refill only as they told me it won't replace all coolant, but roughly 50% of it.

Are they right or are they just lazy? What should I do? Maybe I can tell them to do flush twice then so I at least will be left with only 25% of old coolant instead of 50%? Will they charge me twice for that or only for additional coolant used? To be honest I'm so confused as I was sure coolant flush on e90 was a breeze since we have an electric water pump

P.S. I was also quoted for $250 and up for transmission flush and $90 for break fluid flash - are that numbers ok?

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Coolant flush question?