A restaurant customer left $1.80 as a tip. The tax was 6% and the tip was 20% of the after tax cost. Which information is not needed to compute the bill after tax and tip? What was the total bill?

The % of tax, $10.80

Explanation:

without knowing whether or not taxes were paid, you could still find out the bill with the tips. Let me know if this makes sense or if i still need to explain.

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