The package ticket for the amusement park is 10% off during the "October" period. The original price is 30 yuan. What is the current price?
游乐场的套票"十一"期间九折优惠，原价30元，现价是多少元．
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">30 * (9/10)</gadget>
<output>27</output>

<result>27</result>