Calculate Max’s marginal utility from windsurfing at each number of hours per day. Does Max’s marginal utility from windsurfing obey the principle of diminishing marginal utility?

Max has $35 a day to spend on windsurfing and snorkeling and he can spend as much time as he likes doing them. The price of renting equipment for windsurfing is $10 an hour and for snorkeling is $5 an hour. The table shows the total utility Max gets from each activity.

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Hours per day 1 2 196+WN- 3 4 5 6 7 Total utility from windsurfing 120 220 300 360 396 412 422 Total utility from snorkeling 40 76 106 128 140 150 158