shall be calculated by, substituting for LIBOR in 'the calculation of such rent: the rate quoted by the Lessorto.thetessee On,the:first day pfsuch Fixed Period as its cost'of :Junding thie Uppaid princiOal during•theFixed -period. -.,••••.. • • -5.• • ,.TERM • • • • The-term-)f this Aircraft- Lease•shal