Can you please explain in detail why my answer is incorrect (or why 34 is the correct answer?

Molly attends college and works part-time jot: as a telemarketer. She can work up to 40 hours each week at herjoo, which pays $8 per hour. The table below shows her utility from different levels of leisure and income. Molly is currently working 20 hours per week. If she decides to work 30 hours instead. then her marginal utility loss from having less leisure is: Hours of Total Utility Total Utility Income Leisure from Leisure from Income 0 O D 0 5 18 4O 30 10 34 BO 54 15 48 120 7'2 20 56 160 81 25 50 200 87 30 52 240 90 280 92 a. 18 \\/ i134