Answer:
-20% decrease
Explanation:
40-50=-10
-10/50=-0.2
-0.2*100=-20%
Hope this helps.
The answer is 20%
If 50 is your 100%, take 100 and 90 for example it would be obvious that is it 10% off, so with 50 since it is half of 100 you double the 10% which will be 20%. :)
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