Payment only adding +1 not +10

I have a condition that when a box is checked it should add $10 to the total. However, no matter what I do, it only adds +1. I have tried 10, 10.00, +, *, etc.. It will only add $1. What can I do?

*** Figured it out -- had to put the value in the properties. Helps when you read the user guide!!!

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