Sharing a restaurant bill with friends?!?

If me and three other friends are sharing a restaurant bill and I have a debit card how can I pay for my share of food? Do I ask the server to take a certain amount off my card? For example restaurant bill comes up to 95.68, But my portion is 31.90. How can I pay that with my debit card, I don’t have no cash, if... show more If me and three other friends are sharing a restaurant bill and I have a debit card how can I pay for my share of food? Do I ask the server to take a certain amount off my card? For example restaurant bill comes up to 95.68, But my portion is 31.90. How can I pay that with my debit card, I don’t have no cash, if I’m sharing the restaurant bill with a group of friends?Thank you.
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