the base radius and height of cylindrical shape box are in the ratio of 7:8 . find its height if the cost of painting of its curved surface is Rs 4.00/(m)square is Rs 3.52 ?

the base radius and height of cylindrical shape box are in the ratio of 7:8 . find its height if the cost of painting of its curved surface is Rs 4.00/(m)square is Rs 3.52 ?