A factory divides the garment-making task between workshops A and B at a ratio of 5:3. Workshop A actually produces 960 sets of garments, which exceeds 20% of the original assigned task. How many sets of garments did workshop B originally plan to produce?
某工厂把制衣任务按5：3分给甲、乙两个车间，甲车间实际制衣960套，超过原分配任务的20%，原计划乙车间要制衣多少套？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">960 / (6/5)</gadget>
<output>800</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">800 * (3/5)</gadget>
<output>480</output>

<result>480</result>