RRB NTPC Mains or Stage 2 Model Paper 8 with solutions

Question : 4 of 120

Marks: +1, -0

An order was placed for supply of carpet of breadth 3 metres, the length of carpet was 1.44 times of breadth. Subsequently the breadth and length were increased by 25 and 40 per cent respectively. At the rate of ₹45 per square metre, what would be the increase in the cost of the carpet?

₹1020.6
₹398.8
₹437.4
₹583.2

Validate

Solution:

(c) Initial area of the carpet
= 3 × (3 × 1.44) sq. metre
= 12.96 sq. metre
After corresponding changes in dimensions,Area of the carpet

=[3×125/100]×[3×1.44×140/100]

= 22.68 sq. metre
∴Increase in area
= (22.68 – 12.96) sq. metre
= 9.72 sq. metre
∴Increase in the cost

= ₹(9.72 × 45) =₹437.4

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