Mr. Xiao produces 250 parts a day, and 225 of them are first-class products after inspection. Find the first-class product rate.
肖师傅一天共生产250个零件，经检验有225个是一级品，求一级品率．
<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>