Answer:
Very simply divide the 3 months cost, $180, by 3.
180/3 = 60
y = 60x

Numerator is 3 and denominator is 5. So, we divide the sales price by 3 and we multiply by 5 to get the whole fraction, or 100%.

Your regular price sounds recurring, so you might have made a mistake copying.
The answer for what you've got is 94.633333...
I guess the answer is 56 it doesn't make sense