9 The following graph shows the number of hours an employee worked each week for an 8-week period. 35 ооо 30 25 20 15 10 O 40% 25% 20% THours Worked 80% 0 1 3 4 5 6 Approximately how much has the employee's weekly hours increased between week 1 and week 8? 7 8 Week 9

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