(a) What is the average time for construction, from foundation to key handover, of a government-subsidised house through a project led by the Government, (b) what has been the average time for construction, from foundation to key handover, of a government-subsidised house in the Savanna City housing project and (c) of the planned 18 000 houses in the Savanna City housing project, what is the total number that has been completed to date? NW2126E