I am having difficulties with the midpoint method, I keep coming up with the wrong answer which is getting me a 0 for the first and second attempt. Please help, thank you.

11. Calculating the price elasticity of supply Latasha is a graduate student living in Detroit who works as a caddy to supplement their normal income. At an hourly wage rate of $40, they are willing to caddy 9 hours per week. Upping the wage to I1355 per hour, they are willing to caddy 1? hours per week. Using the midpoint method the elasticity of Latasha's labor supply between the wages of $40 and $55 per hour is approximately 7 , which means that Latasha's supply of labor over this wage range is V