Answer:
$24
Explanation:
Regular Price is = $30 
Discount =20% 
 If Regular Price is $100; after the discount, its price is = $100 − 20% = $80
 If Regular Price is $1; after the discount, its price is = 
 = 0.8 
If Regular Price is $30; after the discount, its price is = 30 × 0.8 = 24