Final answer:
To find the total amount including sales tax and tip, calculate the sales tax as 5% of the dinner bill and the tip as 20% of the dinner bill. Then, add the dinner bill, sales tax, and tip together to find the total.
Step-by-step explanation:
To find the total amount including sales tax and tip, we first calculate the sales tax. The sales tax is 5% of the dinner bill, which is $58.20. So, the sales tax is 0.05 x $58.20 = $2.91.
Next, we calculate the tip. The tip is 20% of the dinner bill, which is also $58.20. So, the tip is 0.20 x $58.20 = $11.64.
Finally, we add the dinner bill, sales tax, and tip together to find the total. The total is $58.20 + $2.91 + $11.64 = $72.75.