Creating expressions within the group

I have the inputs that I formatted current dates to minutes and now I need to calculate by multiplying the this minutes value with the rate(0.50) to display the product in the input>>InputParkingCostPrice text.

Please check the expression in the in GROUP-H >> InputParkingCostPrice text
Here is my shared link for the App:

The problem is that the expression I created does not yield the required results.Please Assist

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