Since, the box is open, there are only five faces instead of six as shown in the figure:
So, there are four walls and one base.
Area of two walls with length, 25 cm =2×(25×25)=1250 cm2
Area of two walls with length, 10 cm =2×(10×25)=500 cm2
Area of the base =25×10=250 cm2
Total surface area = Area of four walls + Area of base =1250+500+250=2000 cm2
Cost of painting is ₹ 2/cm2
So, total cost of painting the box from outside =2000×2=
₹4000