Khan/khan-exercises — Issue #11287: Percentage word problems 1 - Incorrect answer to question
Author: KhanBugz
Created: 2012-01-15 18:40:33+00:00
State: open
Labels: firefox, win7, wrong-or-unclear

The problem question:

"Umaima eats at a cafe and the cost of her meal is $25.00. She would like to leave a 5% tip. What is her total bill including tip?"

But the answer goes on to solve it by calculating a 10% tip:

"The tip amount is equal to 5%×$25.00.

We can find the tip by first calculating a 10% tip and then dividing that number by two.

To calculate a 10% tip, move the decimal point in $25.00 one place to the left.

10%×$25.00=$2.50"

[percentage_word_problems_1.html?seed=28&problem=tip](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/percentage_word_problems_1.html?seed=28&problem=tip&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/percentage_word_problems_1.html?seed=28&problem=tip&debug&activity=%5B%5B%22incorrect-activity%22%2C%22%5C%221.25%5C%22%22%2C75%5D%2C%5B%22incorrect-activity%22%2C%22%5C%22%241.25%5C%22%22%2C14%5D%2C%5B%22hint-activity%22%2C%220%22%2C3%5D%2C%5B%22hint-activity%22%2C%220%22%2C4%5D%5D)

["1.25","$1.25"]

Mozilla/5.0 (Windows NT 6.1; rv:9.0.1) Gecko/20100101 Firefox/9.0.1

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