A bottle of salt water weighs 1000 grams and contains 30 grams of salt. What is the salt content of this bottle of salt water?
一瓶盐水重1000克，其中盐有30克，这瓶盐水的含盐率为多少．
<gadget id="calculator">30 / 1_000</gadget>
<output>3/100 = around 0.03</output>

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

<gadget id="calculator">(3/100) * 1</gadget>
<output>3/100 = around 0.03</output>

<result>3/100 = around 0.03</result>