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About 1973, my high school trig teacher had a huge desktop calculator that did just the basic functions and he told me it cost $300. IIRC, the first scientific calculator I purchased in the early 80's was a Casio and cost around $200.
I'm disappointed in the lack of PDF features on the DX but d*$n I love the screen. It's big and has the best contrast of any Kindle I've owned.
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