My mother’s salary is composed of basic salary and bonus. Last month, my mother used 40% of the basic salary as daily expenses, and deposited the 540 yuan bonus and the rest of the basic salary in the bank. The money deposited in the bank was just equal to my mother’s basic salary. (6/7), how much was my mother's basic salary last month?
妈妈的工资由基本工资和奖金组成，上个月，妈妈把基本工资的40%作为日常开销，把540元奖金和剩下的基本工资存入银行，存入银行的钱正好是妈妈基本工资的(6/7)，妈妈上个月的基本工资是多少元？
<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(6/7) - (3/5)</gadget>
<output>9/35 = around 0.257143</output>

<gadget id="calculator">540 / (9/35)</gadget>
<output>2_100</output>

<result>2_100</result>