A and B have the same amount of money and deposit it in the bank. The interest rate in the first year is 4%, and after one year of deposit, the interest rate will be reduced to 2%. A will continue to deposit the capital and interest in the bank, while B will invest half of the money in the stock market and real estate, earning 20% of the profit, and deposit the other half in the bank. ． One year later, A is 164 yuan less than half of what B earned. So how much yuan did A have?
甲、乙二人原有钱数相同，存入银行．第一年的利息为4%，存入一年后利息降为2%，甲将本钱和利息继续存入银行，而乙将一半钱投资股市及房地产，获利20%，另一半存入银行．一年后，甲比乙赚到的钱的一半还少164元．则甲原来有多少元？
<gadget id="calculator">0.1544 / 2</gadget>
<output>0.0772</output>

<gadget id="calculator">0.0772 - 0.0608</gadget>
<output>0.0164</output>

<gadget id="calculator">164 / 0.0164</gadget>
<output>10_000</output>

<result>10_000</result>