On a sequential basis, for the overall portfolio, the cost of borrowing declined by 8 basis points in the September quarter, supported by a credit rating upgrade that enabled PNB Housing Finance to raise debt in the debt capital markets at a lower cost. On a sequential basis, for the overall portfolio, the cost of borrowing declined by 8 basis points in the September quarter, supported by a credit rating upgrade that enabled PNB Housing Finance to raise debt in the debt capital markets at a lower cost. Economic Times