Jesse buys his co workers lunch from the local steakhouse the food cost 105.79, and the sales tax rate is 9% Jesse wants to leave a 20% tip based on the pre tax amount how much will the total be including tax and tip
First, we need to find the amount of the tip. 20% of the pre-tax amount is (20/100) * 105.79 = $<<20/100*105.79=21.16>>21.16.
Next, we need to add the tip to the pre-tax amount: 105.79 + 21.16 = $<<105.79+21.16=126.95>>126.95.
Now, we need to calculate the amount of tax. 9% of the pre-tax amount is (9/100) * 105.79 = $<<9/100*105.79=9.52>>9.52.
Finally, we add the tax and the pre-tip total to find the total cost: 126.95 + 9.52 = $<<126.95+9.52=136.47>>136.47. Answer: \boxed{136.47}.