The TV factory actually produced 4,500 TV sets in March, which was (1/8) more than the original plan. How many units were originally planned to be produced?
电视机厂三月份实际生产电视机4500台，比原计划多生产(1/8)．原计划要生产多少台？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 + (1/8)</gadget>
<output>9/8 = around 1.125</output>

<gadget id="calculator">4_500 / (9/8)</gadget>
<output>4_000</output>

<result>4_000</result>