A 12 cm by 12 cm ice cube tray is in the shape of a cuboid with twelve hemispheres inset. The depth of each hemispheres is 1 cm.

a) If all the hemispheres were filled with water, calculate the total volume of water that the ice cube tray could hold.

It is now desired to paint the top of the ice cube tray a pleasant shade of blue.
b) calculate the rusface area of one hemisphere on the tray.
c) Calculate the total surface area of the top of the ice cube tray.

Thank you so much for huge help!!!!!