Workers contributed a little more to their 401(k) plans last year, with the average 2011 contribution up to $5,750 from $5,680 a year earlier, with plan participants saving 8% of their salaries on average, according to Fidelity Investments.

At the end of last year’s fourth quarter, the average 401(k) balance was up almost 8% from the prior quarter, to $69,100. Fidelity Investments president of workplace investing, James M. MacDonald, called these results “encouraging.”

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