Teacher Li needs to use rectangular colored paper with a length of 16 cm and a width of 8 cm to cut circular pieces of paper. If the diameter of the circular paper to be cut is 4 cm, how many such circular pieces can be cut from this piece of paper? What percent of the total area of these discs is the total area of the paper? (When calculating, take 3 for π)
李老师要用长是16厘米，宽是8厘米的长方形彩纸剪圆形纸片，如果要剪的圆形纸片的直径是4厘米，这张纸最多可以剪出多少个这样的圆片？这些圆片的总面积占这张纸总面积的百分之几？(计算时π取3)
<gadget id="calculator">16 / 4</gadget>
<output>4</output>

<gadget id="calculator">8 / 4</gadget>
<output>2</output>

<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">16 * 4 * 2</gadget>
<output>128</output>

<gadget id="calculator">2 / 128</gadget>
<output>1/64 = around 0.015625</output>

<gadget id="calculator">3 * 4 * 4 * (1/64)</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>