The correct option is A 6480Rs
Let the height =h. Then Length of wall =2h and breadth =112h.
Cost of white washing wall =Rs 3584.
Area of wall white washed =Costofwhitewashingwallrateofwhitewashingpersq.m=358432=112m2
Area of wall of a room is lateral surface area of a cuboid
Then, 2h(l+b)=112
or,2h(2h+32h)=112or,2h(7h2)=112or,7h2=112or,h2=16orh=4.
Height of cuboid=h=4m
Length of cuboid=2h=8m
Breadth of cuboid=32h=6m
Area of floor =l×b
=8×6=48m2
Cost of tiling the floor at Rs.135 per sq. m =135×48=Rs.6480