Question

the blackboard is 2m 25cm long and 1m 15cm broad find the cost of painting the blackboard at the rate of 25 paise per sq. cm

Answer 1

Length of the blackboard = 225 cm
Width of the blackboard = 115 cm

Then find the area of the blackboard using the formula of area of rectangle.
Area of blackboard = Length x Breadth
=> Area of blackboard = (225 x 115)cm²
=> Area of blackboard = 25875 cm²

100 paise = 1 rupee
25 paise = 0.25 rupee

Cost of painting the blackboard = area of the blackboard x cost per m
=> Cost of painting = 25875 x 0.25
=> Cost of painting = Rs. 6468.75

Answer 2

Answer:

Step-by-step explanation:

Length of the blackboard = 225 cm

Width of the blackboard = 115 cm

Then find the area of the blackboard using the formula of area of rectangle.

Area of blackboard = Length x Breadth

=> Area of blackboard = (225 x 115)cm²

=> Area of blackboard = 25875 cm²

100 paise = 1 rupee

25 paise = 0.25 rupee

Cost of painting the blackboard = area of the blackboard x cost per m

=> Cost of painting = 25875 x 0.25

=> Cost of painting = Rs. 6468.75