Xiao Wang deposited 500 yuan of New Year's money in current savings. If the annual interest rate is 0.72%, how much is the total amount of principal and after-tax interest after half a year?
小王把500元压岁钱存了活期储蓄，如果年利率是0.72%，存满半年时，本金和税后利息一共多少元？
<gadget id="calculator">0.72 / 100</gadget>
<output>0.0072</output>

<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 - (1/20)</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">500 * 0.0072 * 0.5 * (19/20)</gadget>
<output>1.71</output>

<gadget id="calculator">1.71 + 500</gadget>
<output>501.71</output>

<result>501.71</result>