200 wooden balls each of diameter 70 mm are to be painted Find the cost of painting these balls 10 paise-displaystyle cm-2-Rs-3080Rs-2771Rs-4000Rs-7000

Total surface area of 200 balls of-xA0-3510 cm radius will be-xA0-200-xD7-4-xD7-227-xD7-3510-xD7-3510 mmThe cost will be Rs-xA0-200-xD7-4-xD7-22-xD7-35-xD7-357-xD7-10-xD7-10-xD7-100 which simplifies to Rs 3080

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Standard XII

Mathematics

Question

200 wooden balls each of diameter 70 mm are to be painted Find the cost of painting these balls at 10 paise/ $c m^{2}$
Rs.3080
Rs.2771
Rs.4000
Rs.7000

Rs.3080

Rs.4000

Rs.7000

Rs.2771

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Solution

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Total surface area of 200 balls of $\frac{35}{10}$ cm radius will be $200 \times 4 \times \frac{22}{7} \times \frac{35}{10} \times \frac{35}{10}$ mm
The cost will be Rs $\frac{200 \times 4 \times 22 \times 35 \times 35}{7 \times 10 \times 10 \times 100}$ which simplifies to Rs 3080

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200 wooden balls each of diameter 70 mm are to be painted Find the cost of painting these balls at 10 paise/cm2Rs.3080Rs.2771Rs.4000Rs.7000

Total surface area of 200 balls of 3510 cm radius will be 200×4×227×3510×3510 mmThe cost will be Rs 200×4×22×35×357×10×10×100 which simplifies to Rs 3080

200 wooden balls each of diameter 70 mm are to be painted Find the cost of painting these balls at 10 paise/ $c m^{2}$
Rs.3080
Rs.2771
Rs.4000
Rs.7000

Total surface area of 200 balls of $\frac{35}{10}$ cm radius will be $200 \times 4 \times \frac{22}{7} \times \frac{35}{10} \times \frac{35}{10}$ mm
The cost will be Rs $\frac{200 \times 4 \times 22 \times 35 \times 35}{7 \times 10 \times 10 \times 100}$ which simplifies to Rs 3080