Exhibit 99.50 MBNA MASTER CREDIT CARD TRUST II SERIES 2000-K KEY PERFORMANCE FACTORS April 30, 2001 Expected B Maturity 10/17/2005 Blended Coupon 4.9613% Excess Protection Level 3 Month Average 7.64% April, 2001 7.84% March, 2001 7.66% February, 2001 7.42% Cash Yield19.61% Investor Charge Offs 4.98% Base Rate 6.80% Over 30 Day Delinquency 4.89% Seller's Interest 9.33% Total Payment Rate13.70% Total Principal Balance$58,171,313,434.78 Investor Participation Amount$750,000,000.00 Seller Participation Amount$5,425,622,873.29