Let the salary of the person be 100x
Salary spent on Movie and petrol = (10+20)% of 100x=30x
Salary on food = 20% of (100x-30x)=14x
remaining salary = 70x – 14x = 56x
Salary invested on SIP = 50% of 56x=28x
Amount given to wife = 28/30×9000=Rs. 8400
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