The county Xinhua Bookstore shipped 190 bundles of science and technology books, 45 in each bundle, and 6,950 of them have been sold. Based on the information provided, please ask a question and answer it in parallel.
县新华书店运来190捆科技书，每捆45本，已经卖出6950本．请你根据提供的信息，提一个问题，并列式解答．
<gadget id="calculator">190 * 45</gadget>
<output>8_550</output>

<gadget id="calculator">8_550 - 6_950</gadget>
<output>1_600</output>

<result>1_600</result>