The year before last, the average incentive salary of ordinary public institutions in our county was about 40,000 yuan, while the average incentive salary of primary school teachers was 55% less than that of ordinary public institutions. The year before last, the average incentive salary of primary school teachers in our county was about how much?
前年，我县普通事业单位的平均奖励性工资约40000元，而小学教师的平均奖励性工资比普通事业单位的平均奖励性工资少55%，前年，我县小学教师的平均奖励性工资约是多少元？
<gadget id="calculator">55 / 100</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">1 - (11/20)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">40_000 * (9/20)</gadget>
<output>18_000</output>

<result>18_000</result>