When Bingbing calculates "12+□*15", he calculates the addition first, and then the multiplication, and the result is 600. What is the correct number for this question?
兵兵在计算"12+□*15"时，先算加法，后算乘法，得到的结果是600．这道题正确得数应该是多少？
<gadget id="calculator">28 * 15</gadget>
<output>420</output>

<gadget id="calculator">12 + 420</gadget>
<output>432</output>

<result>432</result>