A hemispherical bowl is of radius 7.7 cm. It is to be painted from inside as well as outside. Find the cost (in ₹) of painting the bowl at a rate of ₹17 per 7 cm2. [take π = ]
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 1810.16.
Total surface area to be painted(A) = 4πr2
here, r = radius = 7.7 cm
A = 4 × × 7.7 × 7.7 = 745.36
Rate = ₹17 per 7 cm2
Cost per cm2 = 17/7
Total cost = 745.36 × 17/7 = 1810.16