Hilary is a volunteer fire fighter living in Miami who works as a caddy to supplement their normal income. At an hourly wage rate of $20, they are willing to caddy 2 hours per week. Upping the wage to $40 per hour, they are willing to caddy 5 hours per week. Using the midpoint method, the elasticity of Hilary’s labor supply between the wages of $20 and $40 per hour is approximately , which means that Hilary’s supply of labor over this wage range is .