Xiao Ming deposits 1,400 yuan of New Year's money in the bank, and pays various fees after withdrawing it half a year later. The total is 1,442.84 yuan. What is the monthly interest rate?
小明把过年的压岁钱1400元存入银行，半年后取出来后交各种费用，共1442.84元，问月利率是多少．
<gadget id="calculator">42.84 / 1_400 / 6</gadget>
<output>0.0051</output>

<result>0.0051</result>