A rectangular piece of glass is (4/5) m long and (3/10) m wide. The price of glass per square meter is 75 yuan. How much does it cost to buy this piece of glass?
一块长方形玻璃，长(4/5)m，宽(3/10)m．每平方米玻璃的价钱是75元，买这块玻璃要用多少元？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(4/5) * (3/10)</gadget>
<output>6/25 = around 0.24</output>

<gadget id="calculator">(6/25) * 75</gadget>
<output>18</output>

<result>18</result>