# Inside walls of two rooms of internal dimensions 3 m × 4 m and 4 m × 5 m are to be plastered using 1 ∶ 6 cement sand mortar. Height of the rooms is 3

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Inside walls of two rooms of internal dimensions 3 m × 4 m and 4 m × 5 m are to be plastered using 1 ∶ 6 cement sand mortar. Height of the rooms is 3 m. What is approximate cost of plastering the walls if the rate quoted by a contractor for plastering is Rs. 1,000/- per square meter? Consider total two doors of size 1.2 m × 2 m and four windows of size 1.5 m × 1.5 m are provided and they all are in different walls.

(Rate quoted by the contractor is all inclusive i.e. labour, material, etc.)

1. Rs. 1,25,500
2. Rs. 82,200
3. Rs. 68,300
4. Rs. 56,400

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Correct Answer - Option 2 : Rs. 82,200

Explanation:

Total wall area $= \left[ {\begin{array}{*{20}{c}} {\left( {3 \times 3} \right) \times 2 + \left( {4 \times 3} \right) \times 2}\\ \downarrow \\ {Room\;\left( 1 \right)} \end{array}} \right] + \left[ {\begin{array}{*{20}{c}} {\left( {4 \times 3} \right) \times 2 + 5 \times 3 \times 2}\\ \downarrow \\ {Room\;\left( 2 \right)} \end{array}} \right]$

Total wall area = 96 m2

Total door area = 2 × 1.2 × 2 = 4.8 m2

Total window area = 4 × 1.5 × 1.5 = 9 m2

Area over which plastering to be done wall area – opening area

Cost of plastering of 1 sq.m is = Rs. 1000

∴ Total cost = Rs. 1000 × 82.2 = 82200 /-