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 Question from Johanna: I have a pieces of 3/4" sch40 (round tube) 240" long at $70. What is our cost? We also add 35% to our cost for selling price. How do I figure this out? Hi Johanna, If I understand correctly you have added 35% to your cost and arrived at$\$70.$ Thus if your cost is $C$ dollars then

$C + 0.35 \times C = \70.$

That is

$1.35 C = \70.$

Dividing both sides by 1.35 gives

$C = \frac{\70}{1.35}.$

Penny

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