Nadia charges $7.50 an hour for babysitting. she babysits 18.5 hours the first week of the month and 20 hours the second week of the month. to find her total earnings for those two weeks nadia writes 7.5 x 18.5 + 20 = $158.75, suppose nadia raises her rate by $0.75 an hour. how many hours would she need to work to earn the same amount of money she made in the first two weeks of the month? explain.