Multiple choice

The internal measures of a cuboidal room are 12 m × 8 m × 4 m. Find the total cost of painting all four walls of room, if the cost of painting is Rs. 8.5 per meter square? एक घनाकार कमरे के आंतरिक माप 12 मी. × 8 मी. × 4 मी. हैं । पुताई की लागत 8.5 रूपये प्रति वर्गमीटर है, तो कमरे की सभी चार दीवारों की पुताई की कुल लागत क्या होगी?

  1. Rs. 680

  2. Rs. 1860

  3. Rs. 1580

  4. Rs. 1360
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The area of four walls of a cuboid is given by 2h(l + b), where l=12m, b=8m, h=4m. Area = 2 × 4 × (12 + 8) = 8 × 20 = 160 m². At Rs. 8.5 per m², total cost = 160 × 8.5 = Rs. 1360. Options A, B, and C are incorrect as they don't match the calculated cost.

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