Rates on 10-year fixed-rate private student loans rose last week.The average fixed interest rate on a 10-year private student loan was 7.54% from February 17 to February 22.The average fixed rate on 10-year loans last week rose by 1.08% to 7.54%.Last week, rates on variable five-year student loans moved up, reaching 9.81% from 6.90% the week prior.