Cvs was having a sale, the tissues were 20% of How much money does Nurse smith save on 13 boxes of tissues? How much does she save per box?

1 Answer
smendyka
Jul 27, 2017

See a solution process below:

Explanation:

Let's say the regular price for a single box of tissues was #$x#

Then, the savings on a single box of tissues is:

#s = 20% " of " $x#

Where:

#s# is the savings from the sale on a single box of tissues.

#20%# is the sale percentage. "Percent" or "%" means "out of 100" or "per 100", Therefore 20% can be written as #20/100#.

When dealing with percents the word "of" means "times" or "to multiply".

#$x# is the regular price for a single box of tissues. Rewriting the equation gives:

#s = 20/100 xx $x#

#s = (20 xx 1)/(20 xx 5) xx $x#

#s = (color(red)(cancel(color(black)(20))) xx 1)/(color(red)(cancel(color(black)(20))) xx 5) xx $x#

#s = 1/5 xx $x#

#s = ($x)/5#

The savings on 13 boxes of tissue would be:

#13 xx s = 13 xx ($x)/5#

#13s = ($13x)/5#

If you are given a regular price for a box of tissues, substitute this prices for #$x# and calculate the savings for one box of tissues and #13# boxes of tissues.

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