Assertion (A)	Reason (R)
A hemisphere of radius $7 \mathrm{cm}$ is to be painted outside on the surface. The total cost of painting it at $₹5 \mathrm{per} {\mathrm{cm}}^2$ is $₹2300$	The total surface area hemisphere is $3{\mathrm{\pi r}}^2$.

Use: $\mathrm{\pi }=\frac{22}{7}$

The question consists of two statements, namely,

Assertion $\left(A\right)$ and Reason $\left(R\right)$. For selecting the correct answer, use the following code:

[Use:$\mathrm{\pi }=\frac{22}{7}$]

Assertion (A): If the volumes of two spheres are in the are in the ratio $27:8$ then their surface areas are in the ratio $3:2$.

Reason (R): Volume of Sphere $=\frac{4}{3}\pi R^3$, Surface area of a sphere $=4\pi R^2$.

Choose the correct option for the given assertion and reason.

The radii of the top and bottom of a bucket of slant height $45 \mathrm{cm}$ are $28 \mathrm{cm}$ and $7 \mathrm{cm}$ respectively. Find the curved surface area of the bucket.(Use $\pi =\frac{22}{7}$)

A solid metal cone with a radius of base $12 \mathrm{cm}$ and height $24 \mathrm{cm}$ is melted to form solid spherical balls of diameter $6 \mathrm{cm}$ each. Find the number of balls formed.