Answer:
40%
Step-by-step explanation:
percentage decrease
= [tex] \frac{original - new \: value}{original} \times 100\%[/tex]
Percentage decrease
[tex] = \frac{20 - 12}{20} \times 100\% \\ = \frac{8}{20} \times 100\% \\ = 40\%[/tex]
You could also first calculate the percentage change then get rid of the negative sign to find percentage decrease.
percentage change
= (new -original)/original ×100%
= (12 -20)/20 ×100%
= -40%
Thus, percentage decrease= 40%.
