6.4*25%+5.2*15%.
6.4*25%+5.2*15%．
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">6.4 * (1/4)</gadget>
<output>1.6</output>

<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">5.2 * (3/20)</gadget>
<output>0.78</output>

<gadget id="calculator">1.6 + 0.78</gadget>
<output>2.38</output>

<result>2.38</result>