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4 .. <br />(Thousands of Mexican pesos with purchasing power at December 31, 2001 and thousands of <br />U.S. dollars. except for per share values and exchange rates) <br />Machinery and equipment is mostly imported. An analysis is as follows: <br />2001 2000 <br />Amount Amount <br />in foreign Exchange in foreign Exchange <br />Currency currency rate currency rate <br />U.S. dollar S 211,151 Ps. 9.1500 S 118,128 Ps. 9.5700 <br />German mark S 32,727 Ps. 4.2283 $ 34,440 Ps. 4.3420 <br />Danish crown S 39,881 Ps. 5.4764 S 32.470 Ps. 4.2700 <br />During the periods ended December 31, 2001 and 2000, foreign currency denominated exports, principally by GCC Cemento, S.A. <br />de C.V. and Cementos de Chihuahua, S.A. de C.V., were USD $ 25,079 and USD $ 22,902 (thousand), respectively. <br />9 Lebw OWk*dkxs _ <br />The Company recognizes the liability for seniority premiums based on actuarial computations, using the projected unit-credit <br />_ <br />method. <br />The net period cost and the components of the seniority premium plan allowance at December 31, 2001 and 2ooo are as follows: <br /> 2001 2000 <br />Current benefit obligation Ps. 49x491 Ps. 42.956 <br />Projected benefit obligation Ps. 55,886 Ps. 47,210 <br />Unamortized transition liability PS. 17,352 Ps. 19.644 <br />Plan assets Ps. 430 Ps. 345 <br />Unamortized variances in assumptions and <br />experience adjustments PS. 12,967 Ps. 2,424 <br />Net projected liability PS. 19,232 Ps. 16,693 <br />Additional liability Ps. 17,277 Ps. 19,630 <br />Net period cost Ps. 8,816 Ps. 6,5o6 <br />Intangible asset Ps. 17,277 Ps. 19,580 <br />The unamortized items will be amortized over a period of twelve years from 2001. <br />The significant assumptions considered in determining the net period cost are as fol lows at December 31: <br /> Real rates <br /> 2001 2000 <br />Discount rate 4.50 96 4.50 % <br />Rate of pay increases 1.50 % 1.00 % <br />