A restaurant bill comes to $28.35. How do you find the total cost if the tax is 6.25% and a 20% tip is left on the amount before tax?
See a solution process below:
First, we can determine the amount of the tax:
Where:
Substituting gives:
Next, we can determine the amount of the tip:
Where:
Substituting gives:
Now, we can add the amount of the bill, the tax and tip amounts to find the total cost:
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To find the total cost:

Calculate the amount of tax: $28.35 * 6.25% =$1.77

Add the tax to the original bill: $28.35 +$1.77 = $30.12

Calculate the tip on the original bill amount: $28.35 * 20% =$5.67

Add the tip to the total bill amount: $30.12 +$5.67 = $35.79
So, the total cost is $35.79.
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When evaluating a onesided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a onesided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
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