The expansion of the teaching building of Luodong Central Primary School cost 1.7 million RMB, which is 15% less than the original plan. How much RMB did the original plan cost?
罗东中心小学扩建教学楼，共用了170万，比原计划节省了15%，原计划要花多少万元？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 - (3/20)</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">170 / (17/20)</gadget>
<output>200</output>

<result>200</result>