In a batch of parts, except 25 are qualified products after inspection, the remaining 225 are excellent products, what is the rate of excellent products in this batch of parts?
一批零件，经检验除25个是合格品外，其余的225个都是优等品，则这批零件的优等品率是多少．
<gadget id="calculator">25 + 225</gadget>
<output>250</output>

<gadget id="calculator">225 / 250</gadget>
<output>9/10 = around 0.9</output>

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

<gadget id="calculator">(9/10) * 1</gadget>
<output>9/10 = around 0.9</output>

<result>9/10 = around 0.9</result>