self Maths Puzzle

A saves 20% of his monthly salary. If his monthly expenditure is Rs 6000 then his monthly saving is

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self Other Question

a big big big thanxx to m4maths......placed in TCS 2 hrs before....thanxx to all u guys.....to get through in interviews just be 'Cconfident'..all the very best ....
Q: From 2008 – 2009, book sales decreased by 80%. If sales in 2010 were the same as they were in 2008, by what percent did they increase from 2009 – 2010?