Shares in USA Technologies Inc, a Malvern company that sells cashless payment systems for vending machines, plummeted nearly 40 percent after the company said it would ask the Securities and Exchange Commission for a 15-day extension to file its annual report. The audit committee of USA Technologies' board is "certain of the company's contractual arrangements, including the accounting treatment, financial reporting, and internal controls related to such arrangements," the company said. The delayed 10-K is for the year ended June 30. The shares fell $6.10, or 39.87 percent, to close at $9.20 on Nasdaq.