A right-circular cylindrical water tanker supplies water to colonies on the outskirts of a city and to nearby villages. Each colony has a cuboidal water tank. In villages, people come with matkas (spherical clay pots) to fill water for their household.

(Note: The figures are not to scale.)
i) How many colonies in total would one full tanker be able to supply?
ii) If a tanker supplies water to 3 colonies and then goes to a village where 400 people fill their matkas, roughly how much water is supplied by the tanker in all? Give your answer in `m^3`.
Show your work.
(Note: Assume all the tanks/matkas are completely filled without any loss of water, Take `pi` as `frac{22}{7}` , Use 1000000 cm3 = 1 `m^3`.)