Question

BO.
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%
(C) 2.58%
d) 45.2%
e) None of these​

Answer 1

Answer:

Total cost of painting = Rate × Surface area of sphere

As the radius increases by 10%

Surface area will change by 21%

[using formula a + b + (a × b)/ 100 Total change in cost of painting

= 20+21 +(20x21)/100 =

= 45.2%

Step-by-step explanation:

i hope it will help you..