2 pieces of 10 yuan, 1 piece of 5 yuan and 2 pieces of 30 cents, how much is the total amount?
2张10元，1张5元和2张3角，合起来是多少元．
<gadget id="calculator">10 * 2</gadget>
<output>20</output>

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3 * (1/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">20 + 5 + (3/5)</gadget>
<output>128/5 = around 25.6</output>

<result>128/5 = around 25.6</result>