Conditional Calculation in Dropdown Separate Value

Is it possible to use conditional calculations in a dropdown separate value field?

I am building out a pricing calculator. If the value inputted by the user in field X is greater than 10, I want it to use a different number in the dropdown option in field Y. I added the following conditional calculation to the separate value section in the dropdown, but it doesn’t seem to work at all.

For a better understanding:

User input field: [707]
Dropdown field using separate values: [713]

The user will first enter a value between 2.00-17.00 in field [707].

For one of the options in the dropdown field [713], I added: ([707] > 10) ? (1.90) : (1.5). The goal being that if the user selects a certain option in the dropdown field, it will evaluate the value input in [707] and factor in either 1.9 or 1.5 depending on whether the [707] value is above or below 10.00.

When doing this, no error message occurs; however, the calculation just does not work.

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