The ratio of sides of a ceiling of the auditorium is 5 : 4. The cost of white washing of the ceiling of auditorium at 50 paise per sq. m is Rs.490 and the cost of painting the walls at 40 paise per sq. m is Rs. 252. Find the height of auditorium.
1
6 m
2
5 m
3
10 m
4
8 m
5
12 m