Dynamic drop down choics

Hi folks: I created a dynamic drop-down with choices stored is side a table under a field of type numbers: 15 , 30 ,45, 60. And I created an expression to subtract the value of choice/option from drop down, but it only subtracts the #first item from the table or #lastitem it never subtract the selected option value/number.
Page Link: https://bubble.io/page?type=page&name=citypayparking&id=ipanda-parking&tab=tabs-1

Please Assit

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