I am just completing the Level 3 Lesson 1 assignment. When the dollar amounts with decimal positions are typed into the given fields, the UiDemo app shifts the decimal place thereby making the number larger than that which was entered. Appears to be a bug with the UiDemo app as far as I can tell at this point.
@jOeyO I experienced the same thing with this exercise. I believe some past threads (linked one below) have shown that this was just a bug with the UiDemo app. If you got the automation working with the exception of the decimal issue, I would recommend moving onto the next assignment. 
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Thanks, this is what I suspected but it is nice to have confirmation from others regarding their experience!
sharazkm32
donfeng91
SorenB