March 1, 2017

Homework Help: Math

Posted by Lana on Saturday, February 13, 2010 at 10:04pm.

I posted this problem last night and someone answered. I followed all the steps that this person told me to do and I don't get the right answer. The right answer is suppose to be $23.54. What am I doing wrong?

For groups of four or more diners, many restaurants add a 15% gratuity and a tax of 8% to the bill. If the bill (including gratuity and tax) for four people came to $193, how much was the tip?

assume the 8% tax is added first, then the 15% tip.

So, first, add 8% to the bill amount to get a subtotal

subtotal = 193 + 0.08(193)

The same thing can be done more succinctly as follows:

subtotal = 1.08(193) $208.44

Then take 15% of that to determine the top:

tip = 0.15(subtotal)

To chain it all together:
tip = 0.15(1.08(193)) When you do this it comes to 31.26 that's not the right answer.

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