Answer:
a) not needed: C. the tax was 6%
b) $12.10
Explanation:
You want the total bill including tax and tip, given that the tax was 6% and the tip was $1.10, which was 10% of the after-tax amount.
a) Not needed
To compute the total bill, we only need to know the tip percent and the amount on which the tip is computed. Here, the tip is computed after tax is added, so we do not need to know the tax rate.
b) Total bill
From the tip amount, we know ...
bill with tax · 10% = $1.10
Solving for the bill with tax, we find ...
bill with tax = $1.10/0.10 = $11.00
Then the total bill is ...
total bill = bill with tax + tip
total bill = $11.00 + 1.10 = $12.10
The total bill was $12.10.
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