An only son inherited a 3/4 hectare lot. He decided to build a 40-door condominium on the lot. The floor are of the units is uniform and the total floor area of the entire condominium is 1/5 less than the area of the lot to provide for certain amenities. What is the floor area of each condominium unit?



Total area owned =10000(3/4)=7,500;
less 1/5= 7,500-[7,500/5]
            =6,000 sqre units;
no. of doors = 6,000/40;
                  = 150 doors. ( assuming 1 door/ unit)