A bank in an island country is open every day from 9:00 to 17:00. Under normal circumstances, 500,000 yuan in cash is prepared at 9:00 every day. Assuming that the withdrawal amount is the same every hour, and the deposit amount is the same every hour, you will have 600,000 yuan in cash when you leave work at 17:00. If the amount of withdrawal per hour is 4 times of the normal situation, there will be no cash in the bank at 14:00. If the hourly withdrawal amount is 10 times the normal situation, and the deposit amount is reduced to half of the normal situation, if the bank still has 500,000 yuan in cash when it is off work at 17:00, how much cash should be prepared when the business starts at 9:00 Ten thousand yuan?
某岛国的一家银行每天9：00～17：00营业．正常情况下，每天9：00准备现金50万元，假设每小时的提款量都一样，每小时的存款量也一都一样，到17：00下班时有现金60万元．如果每小时提款量是正常情况的4倍的话，14：00银行就没现金了．如果每小时提款量是正常情况的10倍，而存款量减少到正常情况的一半的话，要使17：00下班时银行还有现金50万元，那么9：00开始营业时需要准备现金多少万元？
<gadget id="calculator">50 / 5</gadget>
<output>10</output>

<gadget id="calculator">60 - 50</gadget>
<output>10</output>

<gadget id="calculator">10 / 8</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">10 + (5/4)</gadget>
<output>45/4 = around 11.25</output>

<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">(45/4) / 3</gadget>
<output>15/4 = around 3.75</output>

<gadget id="calculator">(15/4) * 10</gadget>
<output>75/2 = around 37.5</output>

<gadget id="calculator">(15/4) + (5/4)</gadget>
<output>5</output>

<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">(75/2) - (5/2)</gadget>
<output>35</output>

<gadget id="calculator">35 * 8</gadget>
<output>280</output>

<gadget id="calculator">280 + 50</gadget>
<output>330</output>

<result>330</result>