2016 · Q52
The cost of painting a spherical vessel of diameter 14 cm is Rs. 8008. What is the cost of painting per square centimetre ?
Elementary MathematicsMensuration
- ARs. 8
- BRs. 9
- CRs. 13
- DRs. 14
Explanation
Surface area = 4π(7)² = 616 cm² (using π = 22/7). Total painting cost is Rs 8008, so the cost per cm² = 8008/616 = Rs 13. Hence option C.