Answer:
The equation is sale price=p and the original price is $41.09.
               .70
Step-by-step explanation:
sale price= (1-.30)p   Â
sale price=.70p
.70 Â Â Â Â Â Â Â .70
sale price=p         Â
.70
28.76=p
.70
$41.09=p