Answers

2015-01-20T12:12:15+05:30
Number of change= 70-42
                          = 28
Percentage of decrease= Amount of change / Original amount x 100
                                  = 28 / 70 x 100
                                  = 4 x 10
                                  =  40% 
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2015-01-20T14:08:56+05:30

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So net decrease = 70 - 42 = 28

so percentage decrease =  \frac{28}{70}*100 = 40% ANSWER
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