Given that
Amount given to Rohan by his mother =Rs.3xy2
Amount given to Rohan by his father =Rs.5(xy2+2)
Total amount Rohan have [(3xy2)+(5xy2+10)]=Rs.(8xy2+10)
Total amount spent by Rohan =Rs.(10−3xy2)
After spending Rohan have left money
=RS.(8xy2+10)−Rs.(10−3xy2)=Rs.(8xy2+3xy2+10−10)=Rs.5xy2