Over the last decade - has there really been an almost 350% increase?

Um I did not see the word increase in your post but it is in the title of the op's post. Reading yours where your correcting the op 350 which they plainly identify as increase I can only assume your 350 is more like 190 is in regards to the same thing as your using their number.

And your number is still wrong percent increase from $199.99 to $379.99 is 90.0045percent. The hp12c doesn't lie
 
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