Question

a desk is on sale for 29% off. the sale price is $639.

what is the regular price?

Explanation:

Relate regular price to sale price

Using the Percentage Word Problems knowledge point

$$ \text{Sale Price} = \text{Regular Price} \times (1 - \text{Discount Rate}) $$

Set up the equation

Using the Linear Equations knowledge point

$$ 639 = x \times (1 - 0.29) $$

Simplify the equation

Using the Linear Equations knowledge point

$$ 639 = 0.71x $$

Solve for the regular price

Using the Linear Equations knowledge point

$$ x = \frac{639}{0.71} = 900 $$

Answer:

A desk is on sale for 29% off. The sale price is $639.

What is the regular price?

$ <blank>900</blank>