Xiaorui missed the decimal point when calculating 3.89 plus a two-digit decimal, and the result was 171.89. Please calculate the correct result.
小蕊在计算3.89加上一个两位小数时把小数点看漏掉了，得到结果是171.89．请你算出正确的结果是多少．
<gadget id="calculator">3.89 + 1.68</gadget>
<output>5.57</output>

<result>5.57</result>