Exhibit 99.25 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-C KEY PERFORMANCE FACTORS June 30, 1997 Expected B Maturity 3/15/04 Blended Coupon 5.8472% Excess Protection Level 3 Month Average 3.92% June, 1997 4.89% May, 1997 2.95% April, 1997 N/A Cash Yield 17.16% Investor Charge Offs 4.60% Base Rate 7.68% Over 35 Day Delinquency 4.57% Seller's Interest 10.08% Total Payment Rate 12.14% Total Principal Balance $27,184,721,330.37 Investor Participation Amount $750,000,000.00 Seller Participation Amount $2,741,483,811.88