Question

The length and breadth of a board is 270cm and 90 cm respectively, the perimeter is 720cm. If the cost of painting the board is rs20 per square metre, find the cost of painting the board on one side

Answer 1

Answer:

RS 486000.

Step-by-step explanation:

therefore perimeter of board =

2(l+b) = 720

➡ 2 ( x + 3x ) = 720

➡ 2( 4x ) = 720

➡ 8x = 720

➡ x = 720/8

➡ x = 90

length = 3x = 90*3 = 270 cm

breadth = x = 90 cm

Now, area of board = l * b

➡ 270 * 90 = 24300 cm²

Cost of painting 1 cm² = Rs 20

therefore ,

cost of painting 24300 cm² = 24300 * 20

➡ Rs 486000.

Answer :- cost of painting board on one side is Rs 486000.

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Answer 2

Answer:

Step-by-step explanation:

Areaof rectangle= l×b

First converting into cm is

270/100=2•7

90/100=0.9

L×b=2.7×0.9=2.43

Area of painting2.43sq.m

=2.43×20=48.60