Dabieshan Hope Primary School built a new teaching building. The original plan was to invest 800,000 yuan, but the actual investment was 90% of the plan. How much was the actual investment?
大别山希望小学新建一座教学楼，原计划投资80万元，实际投资是计划的90%，实际投资了多少万元？
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">80 * (9/10)</gadget>
<output>72</output>

<result>72</result>