After a 20% discount at the book store, a recipe book sells for $10. What was the original price of the book?

$12.50

Step-by-step explanation:

Equation: original(1-x%)=new

original(1-20%)=10

We can make the original price x since that is what we are trying to find.

x(1-20%)=10

x-20%x=10

20%=1/5

4/5x=10

multiple by 5/4 to leave x alone

x=5/4*10

x=12.5

So the original price was $12.50

the correct is answer is a 9-sided polygon!

24

step-by-step explanation: