Monday
November 24, 2014

Homework Help: Math

Posted by chaya on Tuesday, April 19, 2011 at 5:09pm.

The variable d represents the cost of a customer's meal, in dollar. The following expression represents the amount paid, including tax.
d + 0.18d
F. The cost plus eighteen percent of the cost
G. the cost minus eighteen percent of the cost
H. the cost plus eight percent of the cost
J. The cost plus one hundred eighteen percent of the cost


I think the answer is F.

I really dont get this question
A merchant spend $92 to buy a calculator
then the merchant sold it with a 21% markup. Katherine used her calculator and found the amount of the markup to be $9.
Explain how you can use estimation to check the reasonableness of Katherine's
calculation


part B
Without doing calculation, tell whether or not Katherine's calculation is reasonable explain your answer

I really dont get this question can u help me

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