(1) Expenditure incurred on cement = \(\frac{Central\,angle\,of\,the\,sector\times\,Total\,cost}{360^\circ}\)
Total cost of the flat = \(\frac{360^\circ\times112500}{75^\circ}=540000\) rupees
(2) Expenditure incurred on labor = \(\frac{Central\,angle\,of\,the\,sector\times\,Total\,cost}{360^\circ}\) = \(\frac{100^\circ\times540000}{360^\circ}\)
= 150000 rupees