TDS is to be deducted on the date of payment or date of credit whichever is earlier. As the first payment (assuming it is an advance, without crediting any bills) was made before 1.10.2009, TDS is to be deducted on Rs. 37500 at old rate. Second payment is being made after 30.09.2009, TDS is to be deducted at New rate.
Thus total TDS liabilit may be worked out as below
Nature of Payment : Contract
First payment :Rs. 37500 - @ 1.03% for sub contract payment (Rs.386)
@ 2.06% for contract payment. (Rs.773)
Second Pymt of Rs.37500 - @ 1% if payee is an individual or HUF(Rs.375 )
@ 2% if payee is a company or firm(Rs.750)