Exhibit 12 COMPUTATIONS OF RATIOS OF EARNINGS TO FIXED CHARGES Three months ended Six months ended March 31 March 31 (Dollars in thousands) 2000 1999 2000 1999 - -------------------------------------------------------------------------------- Income before taxes $188,649 $140,834 $369,599 $235,962 Add fixed charges: Interest expense 6,548 7,443 12,703 16,180 Interest factor on rent 4,360 3,416 8,796 6,993 -------------------------------------------------- Total fixed charges 10,908 $10,859 21,499 23,173 -------------------------------------------------- Earnings before fixed charges and taxes on income $199,557 $151,693 $391,098 $259,135 ================================================== Ratio of earnings to fixed Charges 18.3 14.0 18.2 11.2