Exhibit 99.24 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-C KEY PERFORMANCE FACTORS July 31, 1998 Expected B Maturity 3/15/04 Blended Coupon 5.8172% Excess Protection Level 3 Month Average 4.96% July, 1998 5.24% June, 1998 4.71% May, 1998 4.95% Cash Yield 18.75% Investor Charge Offs 5.14% Base Rate 8.37% Over 35 Day Delinquency 4.90% Seller's Interest 15.22% Total Payment Rate 14.52% Total Principal Balance $37,740,921,726.81 Investor Participation Amount $750,000,000.00 Seller Participation Amount $5,743,527,208.32