If it decreased ⬇
10 - 50/ 50 (100)
That'll give you -40 / 50 (100)
Then,0.8 (100)
Answer: 80%
Then if it increased⬇
50 - 10 / 10 (100)
40 / 10 (100)
4(100)
400% would be your answer
The other reason⬇
10(50)
10 ÷ 50 = .1
.1(50)
Answer: 5
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Then, again your answer could be : 55
