labour and service charges for the execution of the works where the labour and service done in relation to the goods is subsequent to the said transfer of property;
amounts paid by way of price for sub-contract, if any, to sub-contractors ;
charges for planning, designing and architect's fees;
charges for obtaining on hire or otherwise, machinery and tools for the execution of the works contrct;
cost of consumables such as water, electricity, fuel used in the execution of works contract, the property in which is not transferred in the course of execution of the works contract;
cost of establishment of the contractor to the extent to which it is relatable to supply of the said labour and services;
other similar expenses relatable to the said supply of labour and services, where the labour and services are subsequent to the said transfer of property;
profit earned by the contractor to the extent it is relatable to the supply of said labour and services;
Provided that where the contractor has not maintained accounts which enable a proper evaluation of the different deductions as above or where the Commissioner finds that the accounts maintained by the contractor are not sufficiently clear or intelligible, the contractor or, as the case may be, the Commissioner may in lieu of the deductions as above provide a lumpsum deduction as provided in the Table below and determine accordingly the sale price of the goods at the time of the said transfer of property.