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Mathematics 9 Online
OpenStudy (anonymous):

http://prntscr.com/5h3a2p @iGreen @perl

OpenStudy (igreen):

13 / 8.45 will give you cost per

OpenStudy (igreen):

cost per copy* Then multiply that by 27.

OpenStudy (perl):

Let y = cost, x = # copies you can use the model y = k*x

OpenStudy (anonymous):

The answer is 41.53? @iGreen

OpenStudy (anonymous):

@perl

OpenStudy (igreen):

I get that too..but it doesn't seem right. What do you think? @perl

OpenStudy (igreen):

Lol, nevermind.

OpenStudy (anonymous):

It doesn't look right to me neither.

OpenStudy (perl):

lets do it this way

OpenStudy (igreen):

13 doubled is 26..which is close to 27. 8.45 * 2 = 16.9 So the cost of 26 copies is 16.9..27 should just be a little more, right?

OpenStudy (perl):

it costs $8.45 / 13 per copy or $0.65 per copy. Now multiply that by the number of copies

OpenStudy (igreen):

Ohh! That sounds right..we divided the wrong way..lol.

OpenStudy (perl):

right :)

OpenStudy (anonymous):

Wait what...

OpenStudy (perl):

the cost per copy should have been $8.45 / 13

OpenStudy (perl):

The equation we are using is ( cost per copy ) * # copies = total cost

OpenStudy (anonymous):

So 17.55? @perl

OpenStudy (perl):

yes

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