Dear Pon,
Normally, contractors provide manpower to various companies, factories, or establishments in the state as well as to central government offices. For establishments other than central government offices, they pay minimum wages as per the State act. Since your company is subcontracting, you should also adhere to the same standards set by the central wages.
As the profit margin will be tight, you cannot compel the central government office to increase the wages since the contract is awarded to the bidder with the lowest quote. Meanwhile, you must ensure that the subcontractor is paid the right rate.
Here, your only option is to negotiate with the subcontractors and find a mutually beneficial solution, as both parties depend on each other for contractual work.
Thank you.