There is 200 grams of a cup of salt water with a salt content of 10%. After adding 50 grams, what is the salt content of this cup of salt water?
有一杯含盐率为10%的盐水200克，加入50克以后，这杯盐水的含盐率是多少？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">200 * (1/10)</gadget>
<output>20</output>

<gadget id="calculator">20 + 50</gadget>
<output>70</output>

<gadget id="calculator">200 + 50</gadget>
<output>250</output>

<gadget id="calculator">70 / 250</gadget>
<output>7/25 = around 0.28</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(7/25) * 1</gadget>
<output>7/25 = around 0.28</output>

<result>7/25 = around 0.28</result>