The municipal sewage treatment project originally planned to invest 15 million yuan to transform the sewage treatment system, but the actual saving was (1/10) compared to the plan. How much was the actual investment?
市污水处理工程原计划投资1500万元改造污水处理系统，实际比计划节约了(1/10)，实际投资多少万元？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

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

<gadget id="calculator">1_500 * (9/10)</gadget>
<output>1_350</output>

<result>1_350</result>