Using the four numbers of 12.5, (1/2), (3/10), and 7.5 to form a ratio, what is the product of the term in this ratio?
用12.5、(1/2)、(3/10)、7.5这四个数组成比例，这个比例内项的积是多少
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * 7.5</gadget>
<output>3.75</output>

<result>3.75</result>