A period of 4hours 30min is what percent of a day Share with your friends Share 0 Sanjari Kalantri answered this Dear Student, 4 hours and 30 minutes = 412 hours = 92hoursThere are 24 hours in an day.∴ Required Percentage = 9224 × 100 = 316 × 100 = 18.75% 2 View Full Answer Sarthak Sharma answered this 18.75% -2 Sarthak Sharma answered this first right them in fraction that: 4 and 1/2 hour it can also written as 9/2 and then multiply it by 100 your percent is ready -2