proceeds from the sale of equity securities . from time to time , we raise funds through public offerings of our equity securities . in addition , we receive proceeds from sales of our equity securities pursuant to our stock option and stock purchase plans . for the year ended december 31 , 2004 , we received approximately $ 40.6 million in proceeds from sales of shares of our class a common stock and the common stock of atc mexico pursuant to our stock option and stock purchase plans . financing activities during the year ended december 31 , 2004 , we took several actions to increase our financial flexibility and reduce our interest costs . new credit facility . in may 2004 , we refinanced our previous credit facility with a new $ 1.1 billion senior secured credit facility . at closing , we received $ 685.5 million of net proceeds from the borrowings under the new facility , after deducting related expenses and fees , approximately $ 670.0 million of which we used to repay principal and interest under the previous credit facility . we used the remaining net proceeds of $ 15.5 million for general corporate purposes , including the repurchase of other outstanding debt securities . the new credit facility consists of the following : 2022 $ 400.0 million in undrawn revolving loan commitments , against which approximately $ 19.3 million of undrawn letters of credit were outstanding at december 31 , 2004 , maturing on february 28 , 2011 ; 2022 a $ 300.0 million term loan a , which is fully drawn , maturing on february 28 , 2011 ; and 2022 a $ 398.0 million term loan b , which is fully drawn , maturing on august 31 , 2011 . the new credit facility extends the previous credit facility maturity dates from 2007 to 2011 for a majority of the borrowings outstanding , subject to earlier maturity upon the occurrence of certain events described below , and allows us to use credit facility borrowings and internally generated funds to repurchase other indebtedness without additional lender approval . the new credit facility is guaranteed by us and is secured by a pledge of substantially all of our assets . the maturity date for term loan a and any outstanding revolving loans will be accelerated to august 15 , 2008 , and the maturity date for term loan b will be accelerated to october 31 , 2008 , if ( 1 ) on or prior to august 1 , 2008 , our 93 20448% ( 20448 % ) senior notes have not been ( a ) refinanced with parent company indebtedness having a maturity date of february 28 , 2012 or later or with loans under the new credit facility , or ( b ) repaid , prepaid , redeemed , repurchased or otherwise retired , and ( 2 ) our consolidated leverage ratio ( total parent company debt to annualized operating cash flow ) at june 30 , 2008 is greater than 4.50 to 1.00 . if this were to occur , the payments due in 2008 for term loan a and term loan b would be $ 225.0 million and $ 386.0 million , respectively . note offerings . during 2004 , we raised approximately $ 1.1 billion in net proceeds from the sale of debt securities through institutional private placements as follows ( in millions ) : debt security date of offering principal amount approximate net proceeds .

date of offering: 7.50% ( 7.50 % ) senior notes due 2012: 2004
3.00% ( 3.00 % ) convertible notes due august 15 2012: 2004
7.125% ( 7.125 % ) senior notes due 2012: 2004
principal amount: 7.50% ( 7.50 % ) senior notes due 2012: 225
3.00% ( 3.00 % ) convertible notes due august 15 2012: 345
7.125% ( 7.125 % ) senior notes due 2012: 200
total: 1070
approximate net proceeds: 7.50% ( 7.50 % ) senior notes due 2012: 221.7
3.00% ( 3.00 % ) convertible notes due august 15 2012: 335.9
7.125% ( 7.125 % ) senior notes due 2012: 199.8
total: 1050.2

2022 7.50% ( 7.50 % ) senior notes offering . in february 2004 , we sold $ 225.0 million principal amount of our 7.50% ( 7.50 % ) senior notes due 2012 through an institutional private placement . the 7.50% ( 7.50 % ) senior notes mature on may 1 , 2012 , and interest is payable semiannually in arrears on may 1 and november 1 of each year. .

Questions:
what is the principal amount for the 7.50% senior notes due 2012?
what about the annual interest rate?
what annual interest expense does this represent?
what about the annual interest expense related to the 3.00% convertible notes due in 2012?

Answers:
225.0
7.50%
16.9
10.4