Question

Francis heard that a car stereo system was on sale for 30% off. If the sale price was 57.75, what was the original price of the stereo?

Answer 1

Answer:

$82.5

Step-by-step explanation:

We can calculate it with a direct rule of 3. As it has a 30% off, the remaining price is the 70% and we want to know how much is the 100%

$70\% -\!\!\!-\!\!\!- \ 57.75\\ 100\% -\!\!\!-\!\!\!- \ x$

We use the formula of the direct rule of 3:

$x = \frac {100/100*57.75}{70/100} \\ \\ x = \frac {57.75}{70/100}\\ x = 57.75 * 100/70$

x = 82.5

The original price of the stereo was $82.5