The regular price of a space invader game is $52 but it is on sale. the discount is $13. what percent discount is this?

We can restate this problem as:

$13 is what percent of $52?

First, let's call the percent we are looking for "p" or p%.

"Percent" or "%" means "out of 100" or "per 100", Therefore p% can be written as p100.

When dealing with percents the word "of" means "times" or "to multiply".

Putting this all together we can write this equation and solve for p while keeping the equation balanced:

$13=p100×$52

$13=$52p100

$13×100$52=$52p100×100$52

$1300$52=$52p100×100$52

$1300$52=$52p100×100$52

130052=p

25=p

step-by-step explanation:

to find if any function is an inverse of the other, put the first equation in as x in the next one. then simplify and solve. if at the end you get the statement y = x, then it is an inverse. if you get anything else, it is not.