A floral design on a floor is made up of 16 tiles which are triangular, the sides of the triangle being 9 cm, 28 cm and 35 cm (see figure). Find the cost of polishing the tiles at the rate of 50 p per .
Semi-perimeter of 1 triangular tile cm
Using Heron's formula, Area of 1 triangular tile
Area of 16 triangular tiles .
Polishing of 1 of area costs 50 p
Polishing of of area would cost Rs