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Answer

In the beginning, 

mobile phone : TV =  5u : 7u

After reduction

 5u – 100         :             7u – 150   =  8 : 11

11 ( 5u – 100) = 8 ( 7u – 150 )

55u – 1100 = 56u -1200

u = 100

5u = 500

100% × 100/500 = 20%

Percentage decrease in price of mobile phone is 20%

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