Exhibit 99.24 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-C KEY PERFORMANCE FACTORS March 31, 1998 Expected B Maturity 3/15/04 Blended Coupon 5.8485% Excess Protection Level 3 Month Average 5.12% March, 1998 5.81% February, 1998 4.69% January, 1998 4.86% Cash Yield 18.54% Investor Charge Offs 4.85% Base Rate 7.88% Over 35 Day Delinquency 5.06% Seller's Interest 11.41% Total Payment Rate 13.80% Total Principal Balance $33,909,306,783.29 Investor Participation Amount $750,000,000.00 Seller Participation Amount $3,867,972,264.80