Answer:
No
Explanation:
To find how much something is a percent of another number, divide it by said other number
20/40 = 0.5
0.5 × 100 = 50%
The first one is a 50% increase
Then, 40/20 = 2
2 × 100 = 200%
It is a 200% decrease
So no, because 50% doesn't equal 200%