Question

Due to dwindling reserves of copper ore, the price of a 100-foot spool of copper wire increased 20% this year to $144. What was the old price (last year's price) for a 100-ft spool of wire?
$130
$145
$120
$115

Answers

Ms. Sue
1.2x = 144
x = ?
Dawn
I have no idea what you mean.
Ms. Sue
It's a basic algebraic equation.

Let x = the original price. The price has increased by 120% which is 1.2

1.2 times x = 140

To solve for x, divide both sides of the equation by 1.2


Dawn
Thank you for explaining.

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