Jeese buys his coworkers lunch from the local steakhouse. The food costs $105.79, and the Sales tax rate is 9%. Jeese wants to leave a 20% tip based on the pre-tax amount. How much will the total be, including tax and tip?
The sales tax amount is $105.79 * 0.09 = $<<105.79*0.09=9.52>>9.52.
The total amount before the tip is added is $105.79 + $9.52 = $<<105.79+9.52=115.31>>115.31.
The tip amount is $115.31 * 0.20 = $<<115.31*0.20=23.06>>23.06.
The total amount is $115.31 + $23.06 = $<<115.31+23.06=138.37>>138.37. Answer: \boxed{138.37}.