Question

The floor of a rectangular ball has a perimeter of 200m. If the cost of painting the four walls at the rate of 10 per m2 is 10000 find the height of the hall

Answer 1

Cost of painting 1m²=10
With 10 rupees,Area painted=1m²
With 1 rupee,Area painted=1/10m²
With 10000 rupees, Area painted= 1/10 *10000=1000 m²
Area of four walls= 2(L+B)H=1000
2(L+B)=200(perimeter)

So 200H=1000m²
So height is 5 metres!