Student Wang Meng did 40 questions and got 1 question wrong. What is the correct rate of student Wang Meng?
王萌同学做了40道题，错了1道题，王萌同学做题的正确率是百分之几？
<gadget id="calculator">40 - 1</gadget>
<output>39</output>

<gadget id="calculator">39 / 40</gadget>
<output>39/40 = around 0.975</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(39/40) * 1</gadget>
<output>39/40 = around 0.975</output>

<result>39/40 = around 0.975</result>