A factory planned to produce 250,000 pieces of products, but actually increased production by 45,000 pieces. How much was the increase?
某工厂计划生产25万件产品，实际增产了4.5万件，增产了多少．
<gadget id="calculator">4.5 / 25</gadget>
<output>0.18</output>

<result>0.18</result>