Question

a room has l=8.5cm , b=6.5cm and h= 3.4 cm . it has 2 doors measuring 1.5 *2cm and 2 windows 13m *3cm. find the cost of white washing at 700 ₹/m2 and painting the ceiling at 1000 ₹/m2??​

Answer 1

Answer:

Length = 8.5 m

Breadth = 6.5 m

Height = 3.4 m

Area of the four walls = {2(l + b) h} sq. units

= {2(8.5 + 6.5) 3.4}m2 = {30 3.4} m2 = 102 m2

Area of one door = (1.5 1) m2 = 1.5 m2

∴ Area of two doors = (2 1.5) m2 = 3 m2

Area of one window = (2 1) m2 = 2 m2

∴ Area of two windows = (2 2) m2 = 4 m2

Total area of two doors and two windows = (3 + 4) m2

= 7 m2

Area to be painted = (102 - 7) m2 = 95 m2

Rate of painting = Rs 160 per m2

Total cost of painting = Rs (95 160) = Rs 15200