Uncle Zhang’s annual salary was 180,000 yuan last year, he paid 10% of personal income tax, and invested 15% in his son’s education. How many yuan does Uncle Zhang have left?
张叔叔去年年薪18万元，缴纳个人所得税10%，给儿子教育投资15%，张叔叔还剩多少万元．
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 - (3/20)</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">18 * (9/10) * (17/20)</gadget>
<output>1_377/100 = around 13.77</output>

<result>1_377/100 = around 13.77</result>