1. On Sunday night Rena's sleep tracker recorded 7.2 hours of sleep, but on Monday night a sick kid, another with nightmares, and a yowling cat kept waking her up.Her sleep tracker recorded only 4.9 hours of sleep Monday night.What was the percent change in Rena's sleep over these two days?
2. 3.9%
3. -31.94%
4. 31.94%
5. -3.43%