Answer:
the value has decreased by $6 so the final price of the book is $24
Step-by-step explanation:
use the [tex]\frac{part}{whole} = \frac{part}{whole}[/tex] formula
replace the first part with 20 and whole with 100
for the second part substitute it with a variable and the whole is the original price so it would be 30
cross multiply, then divide to get the final answer
