The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is?

The moisture content of sludge is reduced from 90% to 80% in a sludge

1.	The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is?
A.	25 %
B.	50 %
C.	10 %
D.	5 %
Answer» C. 10 %