Qin Litao's family has a paddy field. This year they harvested 900 kilograms of rice, which is 100 kilograms more than last year. By what percentage has the rice field increased this year?
秦利涛家有一块稻田，今年收稻谷900千克，比去年增产了100千克．这块稻田今年增产了百分之几？
<gadget id="calculator">900 - 100</gadget>
<output>800</output>

<gadget id="calculator">100 / 800</gadget>
<output>1/8 = around 0.125</output>

<result>1/8 = around 0.125</result>