TDS on Rent included in purchase Bill

We have Tea Vending Machines in our office on hire basis and accordingly the supplier charges the consolidated bills for conusmables (Like Tea bags, Sugar, Milk etc) and the Rent for the machine as well. He charges VAT 12.5% on monthly rental of Machine and applicable VAT for consumables too. 

Now my query is : Whether I should deduct the TDS on only monthly rental charges inclusive VAT or Exclusive of VAT or on the total bill value inclusive of VAT on cosumables too  ??

Pls reply as early as possible. (if possible give the circular / notification ref also)

Thanks