Assuming you made an error typing the question out, and the formula should say 30g, as it's $30 a round:

Answer:
30 divided by 0.40 = 75
The original price was $75
Step-by-step explanation:
Yes there can be more than one answer because it can go on forever
3 to 2
6 to 4
9 to 6
12 to 8
it can go on forever
312 is the LCM for this set
X=40 because you set all the degrees equal to 360 degrees because its a circle :)