Investors were pleased with results.Shares of Capital One Financial (COF 5.82%) rallied as much as 9.5% on Friday, before pulling back to a 5.6% gain as of 2:25 p.m. ET.The tech-savvy credit card and auto lender reported earnings last night, showing a healthy beat of analyst expectations and a significant increase in net interest income. Investors cheered the results.Net interest income inflects higherCapital One delivered $10 billion in revenue in the quarter, up 7% year-over-year, and adjusted (non-GAAP) ...