Calculating the price elasticity of supply

Clancy is a retired teacher living in San Diego who works as a caddy to supplement their normal income. At an hourly wage rate of $$15,$ they are willing to caddy $3$ hours per week. Upping the wage to $$30$ per hour, they are willing to caddy $8$ hours per week.

Using the midpoint method, the elasticity of Clancy$$s labor supply between the wages of $$15$ and $$30$ per hour is approximately $,$ which means that Clancy$$s supply of labor over this wage range is $.$