Read the text and choose the best answer.

What percentage did Sarah and Oliver decide to leave as a tip?

Oliver: Hi, Sarah. Thanks for meeting me here.
Sarah: No problem! I've never been to this restaurant before. It looks nice.
Oliver: Yeah, I made a reservation earlier today. We have a table over there near the window.
Sarah: Oh, great! Have you looked at the menu yet?
Oliver: Yeah, I have. They have a lot of interesting dishes. I think I'll try the salmon.
Sarah: The salmon sounds good. What are their specials today?
Waitress: Good evening! Are you ready to order?
Oliver: Yes, we are. I'll have the salmon, please.
Sarah: And I'll go for the steak.
Waitress: Great choices! Would you like any sides with that? Our mashed potatoes are very popular.
Sarah: Sure, I'll have mashed potatoes and grilled vegetables.
Oliver: Just a side salad for me, thanks.
Waitress: Okay, your meals will be out shortly. Would you like anything else while you wait?
Oliver: Can we get some bread and butter, please?
Waitress: Of course. And would you like something to drink?
Sarah: A cup of tea, please.
Oliver: And I'll have a glass of water.
Waitress: Coming right up. Enjoy your meal!
\(A few minutes later\)
Sarah: This steak is cooked perfectly. How's your salmon, Oliver?
Oliver: It's delicious. Do you want to split a dessert?
Sarah: Maybe just one. What do they have on the dessert menu?
Waitress: Here you go. We have cheesecake, tiramisu, and chocolate cake.
Oliver: Let's get the cheesecake.
Sarah: That sounds perfect. Can we get the check, please?
Waitress: Your total comes to $57.50.
Oliver: Thanks. Here's $60. Can we get change for a tip, please?
Waitress: Of course. How much would you like to leave?
Sarah: Let's do 20 percent.
Oliver: Sounds good to me.
Sarah: That was such a great meal!
Oliver: Yeah, and it wasn't too expensive either.
Sarah: Definitely. I'll have to come back again sometime.

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