From a solid hemisphere whose radius is $2.1 \mathrm{cm}$, a conical cavity of the same height and same diameter is hollowed out. Find the total surface area of the remaining solid to the nearest ${\mathrm{cm}}^2$ and also find out the cost of painting the remaining solid green at the rate of $₹ 1.25$ per square cm. [Use $\sqrt{2}=1.41]$

A toy is in the shape of a cylinder with two equal cones stuck to each other of its ends. The length of entire solid is $30 \mathrm{cm}$ and diameter of cylinder and cones $10.5 \mathrm{cm}$ and the length of the cylinder is $14 \mathrm{cm}$. If its surface area is$k {\mathrm{cm}}^2$ (correct up to two decimal places) then find $k$.​ (Take $\mathrm{\pi }=\frac{22}{7}$)

A medicine capsule is in the shape of a cylinder with two hemispheres stuck to each of its ends. The length of the entire capsule is $16 \mathrm{mm}$ and the diameter of the capsule is $14 \mathrm{mm}$. If its surface area is $k {\mathrm{mm}}^2$ then find $k$.

Rasika purchased a candle from market for Diwali festival. The shape of the candle is shown in Fig. She purchased a packet of $24$ candles. If the surface areas of candles is$k {\mathrm{cm}}^2$ then find the value of $k$ correct up to one decimal places. (Take $\mathrm{\pi }=\frac{22}{7}$)

A wooden belan was made from a big cylinder and two equal small cylinders to flatten the dough as shown in the figure. If the surface area of the belan is $k {\mathrm{cm}}^2$ then find $k$​. (Take $\mathrm{\pi }=\frac{22}{7}$)

A pulley was made from two big equal cylinders stuck at the end of a small cylinder to draw water from the well, as shown in the figure. If its curved surface area is $k {\mathrm{cm}}^2$ then find $k$.