There is a certain amount of salt water with a salt content of 3% in the container. After adding a glass of water, the salt content is 2%. What is the salt content after adding the same glass of water?
容器内有含盐3%的盐水若干，加入一杯清水后，含盐率为2%，再加入同样一杯清水后含盐率为多少
<gadget id="calculator">3 / 100</gadget>
<output>3/100 = around 0.03</output>

<gadget id="calculator">100 * (3/100)</gadget>
<output>3</output>

<gadget id="calculator">3 / 200</gadget>
<output>3/200 = around 0.015</output>

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

<gadget id="calculator">(3/200) * 1</gadget>
<output>3/200 = around 0.015</output>

<result>3/200 = around 0.015</result>