Exhibit 12 COMPUTATIONS OF RATIOS OF EARNINGS TO FIXED CHARGES Three months ended Six months ended March 31 March 31 (Dollars in thousands) 1999 1998 1999 1998 - -------------------------------------------------------------------------------- Income before taxes $140,834 $171,194 $235,962 $347,459 Add fixed charges: Interest expense 7,443 8,218 16,180 18,965 Interest factor on rent 3,416 2,939 6,993 5,830 --------------------------------------------------- Total fixed charges $10,859 $11,157 23,173 $24,795 --------------------------------------------------- Earnings before fixed charges and taxes on income $151,693 $182,351 $259,135 $372,254 ================================================== Ratio of earnings to fixed charges 14.0 16.3 11.2 15.0 26