Access Query- perameter box wont go away & calculation fields issues #NUM

Owners'IncomeQuery:

I need to get rid of this paramret box as it is not supposed to be there. I have searched online videos and cant get rid of it.
I just need a caluclated field - Income: [Price Per Day]*[Rental End Date]-[Rental Start Date], the results are coming up with #NUM

same thing with TopCustomers

Same thing with TopGrossingVehicles
I wrote:
Gross Income:

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, but it is not giving me the grand total, just price per day.

same thing with:
CustomerRentalSummaryforRprt

Once the parameter values get fixed in Owners'IncomeQuery & CustomerRentalSummaryforRprt, that will fix the data for both reports.

I have a dummy test I been working on to try and perfect it, attached.

I was just missing those () brackets. Works like a charm! thx