Merger-bound mortgage lender HDFC on Thursday concluded its rupee-bond sale through the private placement route, mopping up Rs 25,000 crore. HDFC said it has raised Rs 25,000 crore of 10-year money by issuing non-convertible debenture (NCDs) carrying a coupon rate of 7.97 per cent per annum. This translates to a spread of 49 basis points over Wednesday's closing of the 10-year government securities yield.