The correct
answer to this problem is A,
$40. Here is one way to solve this
problem.
Begin by making the numbers we are working with
easier to work with in our head. So round the
cost of the book to $20 and the percent of the
original price to be 50%. Notice we round down
to 50% instead of up to 60%? You want to do this
because you should notice that 20 and 5 are much
easier to work together than 20 and 6. Let's
continue on so you see why.
To solve this percent problem, you set up your
equation to solve as:
$20 (is) = X (original
price) times 50%
Let's rewrite it so we can solve the problem.
20 = X * .50
Solving for X, you divide both sides by .50,
which you now you can see why we used .50 instead
of .60. 5 divides into 20 evenly.
20 divided by 5 equals 4, but we need to move
our decimal point one more place to the right
because of the decimal point in the divisor.
Our answer becomes 40 or $40 would be about
the original cost of the book.
For your final answer to this problem, you need
to remember that you need explain your solution
as well as give the final answer. This would
be a 2 point question so be sure to state the
answer and then an explanation of how you solved
the problem. One possible answer could be:
The answer to this problem is letter A, $40.
I found this answer by rounding the price of
the book to $20 and the percent of the original
cost to 50%. I then divided 50% into $20 to find
my answer. $20 divided by 50% equals $40. And
that is my answer!
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