How do you find income elasticity with total utility?
Hours/month Total Utility Windsurfing Total Utility Snorkeling
0_____________0____________________0
1_____________60___________________20
2_____________110__________________38
3_____________150__________________53
4_____________180__________________64
5_____________200__________________70
Devon's total income rises from $35 to $55, ceteris paribus. Given that Devon changes his of choice of windsurfing and snorkeling, what is his income elasticity for windsurfing?