There is a cylindrical water cup, measured from the inside, the diameter of the bottom surface is 8 cm, if the water cup is filled with 15 cm deep water, the water just accounts for 80% of the volume of the water cup. What is the volume of this cup in milliliters?
有一个圆柱形状的水杯，从里面量，底面直径是8厘米，如果水杯里盛有15厘米深的水，这些水恰好占水杯容积的80%．这个水杯的容积是多少毫升？
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

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

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">15 / (4/5)</gadget>
<output>75/4 = around 18.75</output>

<gadget id="calculator">3.14 * 16 * (75/4)</gadget>
<output>942</output>

<result>942</result>