Average rate on a US 30-year mortgage rises to 6.89%, its highest level since early February

By ALEX VEIGA, AP Business Writer The average rate on a 30-year mortgage in the U.S. rose this week to its highest level since early February, further pushing up borrowing costs for homebuyers. The rate increased to 6.89% from 6.86% last week, mortgage buyer Freddie Mac said Thursday. A year ago,…