Gasoline price up average of a penny a day

  SEATTLE — Washington gas prices rose 7.3 cents per gallon in the week ending March 7, to an average of $3.10, according to GasBuddy’s daily survey of 2,666 stations across the state. The prices in Washington were 30.4 cents per gallon higher than a month earlier and stood 10 cents per gallon higher than a…