Master Li plans to complete a batch of parts in 7 days, producing 50 per day, but actually produces 40% more per day. How many days will it actually take to complete the task?
李师傅计划7天完成一批零件，每天生产50个，实际每天多生产40%，实际用多少天完成任务？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 + (2/5)</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">50 * (7/5)</gadget>
<output>70</output>

<gadget id="calculator">7 / 70</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">50 * (1/10)</gadget>
<output>5</output>

<result>5</result>