Mr. R.’s World of Math

     “I don’t know about you guys, but I’m not getting on that thing!” said David.
     “Nobody’s getting on it,” said Serena, “Look at this sign.”
All of the students looked. They saw a little sign outside the elevator that said:

One Ride To center of Earth
$45.67

     “Oh, great, we have to pay again!” yelled Greg, “Does anyone have any money?”
     “I have $5.67,” said David.
     “I have $7.65,” said Hannah.
     “I have $13.58,” said Justin.
     “I have $3.77,” said Serena.
     “And I have $8.67,” said Greg.

How much money did the students have altogether?