Frances is a retired teacher who lives in Denver and does some consulting work for extra cash. At a wage of $50 per hour, she is willing to work 10 hours per week. At $65 per hour, she is willing to work 19 hours per week. Using the midpoint method, the elasticity of Jake’s labor supply between the wages of $50 and $65 per hour is approximately _______ , which means that Jake’s supply of labor over this wage range is ______ .