This level 6 #summermathchallenge should be a challenge for anyone with a junior high education. Good Luck!
Luby bought a calling card in order to talk to her father in Serbia. With the card, calls cost $0.09 per minute. However, calls are billed only in 4 minute intervals. So a call that lasts 3 minutes is charged as 4 minutes and a call that is 6 minutes is charged as 8 minutes. Luby made 3 calls. The first call was 15 minutes. The second call was 34 minutes. The third call was 22 minutes. If Luby started with $20 on the card, how much money is left on the card now?
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