Calculator is not working as expected

Hello @sitepoint
I made javascript calculation that works when i enter data manually! (i bet it could be much much smaller but i m noob on this at the moment)

Now i added data from database and the issue is that it do not calculate empty inputs :frowning:

i made an example here: https://jsfiddle.net/trhbuwg7/1
Price and Percentage is coming from database.

Any advice or help would be appreciated!

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