Stock and fixed-income mutual funds' net sales rose 22 percent in April from March, despite volatile market performance.

Stock and fixed-income funds had estimated net sales of $26.5 billion in April, up from the $21.7 billion in March, according to estimates from Financial Research Corp. of Boston, a financial services tracking and consulting firm. FRC attributed the sales growth to an increase in investing through Individual Retirement Accounts in April.

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