What is the value of ab+c when a=4, b=0.3, c=5.
当a=4、b=0.3、c=5时ab+c的值是多少．
<gadget id="calculator">4 * 0.3</gadget>
<output>1.2</output>

<gadget id="calculator">1.2 + 5</gadget>
<output>6.2</output>

<result>6.2</result>