Casio cash register?

Can I use this in calculator mode and also open the drawer in this mode without turning the key and losing my calculations? or can I set it to have no sales tax in register mosde? I get invoices from customers that already have tax applied so I don't need tax added by the register. I just need to do $xx.xx (the amount the customer gives me) -minus- $xx.xx (their total) without the tax and be able to open the drawer to give change

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