Let's go through each step one by one:
Step 1: Determine the 20% tip of the food costs.
Pre-tax food cost: $105.79
Tip percentage: 20%
To calculate the tip:
\[ \text{Tip} = \text{Food Cost} \times \text{Tip Percentage} = 105.79 \times 0.20 \]
\[ \text{Tip} = 105.79 \times 0.20 = 21.158 \]
Rounding to the nearest hundredth:
\[ \text{Tip} = 21.16 \]
Step 2: Determine the 9% sales tax of the food costs.
Sales Tax Rate: 9%
To calculate the sales tax:
\[ \text{Sales Tax} = \text{Food Cost} \times \text{Sales Tax Rate} = 105.79 \times 0.09 \]
\[ \text{Sales Tax} = 105.79 \times 0.09 = 9.4781 \]
Rounding to the nearest hundredth:
\[ \text{Sales Tax} = 9.48 \]
Step 3: Determine the total price of the meal including the tip and tax.
To find the total price, we sum the food cost, tip, and sales tax:
\[ \text{Total Price} = \text{Food Cost} + \text{Tip} + \text{Sales Tax} \]
\[ \text{Total Price} = 105.79 + 21.16 + 9.48 \]
Calculating the total:
\[ \text{Total Price} = 136.43 \]
Thus, the final values for each step are:
- Tip: $21.16
- Sales Tax: $9.48
- Total Price: $136.43