Trying to find Tip amount for Landscaping service workbook.

[enjoi2p0]

I've made a Landscaping Price service but I can't get the Tip amount to add up properly. I'm trying to get the Tip amount which is a 6.5% of the cost of the hours worked, ground cover cost and plants cost. As of now I can't figure it out it just prints ($0.00) that's it.

[stnkynts]

You can't create a variable based upon other variables prior to those variables being defined. Change this section:

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