The variable d represents the cost of a customer's meal, in dollar. The following expression represents the amount paid, including tax.

Question

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 don't 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 don't get this question can u help me

Answer 1

Your first answer is right.

If you take 20% of 100, you'll get $20. It looks like Katherine's estimate is way off.

Answer 2

Another way to approach this problem is to look the relationship between 9 and 90. 9 is 10% of 90, right?

Answer 3

thanks your great

Answer 4

You're very welcome. :-)

Answer 5

For the first question, the expression given is d + 0.18d, which can be simplified as 1.18d. This means that you are adding 18% of the cost to the cost itself.

The correct answer is G. The cost minus eighteen percent of the cost.

To explain how to get the answer, we simplify the expression by combining like terms. In this case, we can factor out a d from both terms in the expression:

d + 0.18d = 1d + 0.18d

Simplifying further, we add the coefficients of d:

1d + 0.18d = 1.18d

So, the expression is actually equal to 1.18d, which represents the cost plus eighteen percent of the cost.

Now, for the second question about checking the reasonableness of Katherine's calculation:

Katherine calculated the markup to be $9, but we want to estimate to check if this calculation is reasonable.

If the merchant spent $92 to buy the calculator, and the markup is 21%, we can estimate the markup using the following steps:

1. Calculate 21% of $92:

0.21 * $92 = $19.32

2. Compare the estimated markup of $19.32 with Katherine's calculation of $9.

By estimating the markup to be around $19.32, we can see that Katherine's calculation of $9 is significantly lower. Therefore, based on estimation alone, Katherine's calculation does not seem reasonable.