The radius of a sphere is 14 cm. The cost of
painting the surface of sphere is ₹25 per
square cm. If the radius of sphere is increased
by 10%, then the cost of painting is increased
by 20%. What is the percentage increase in
the total cost of painting per square cm?
(a) 54.27%
(b) 20.3%
(d) 45.2%
(c) 2.58%