Processing a batch of parts, A processes 50 parts per hour, and it takes 36 hours to complete, B processes 20% more than A per hour, how many hours does B need to process this batch of parts? (Answer with proportional knowledge)
加工一批零件，甲每小时加工50个，需要36小时完成，乙每小时比甲多加工20%，乙加工这批零件需要多少小时？(用比例知识解答)
<gadget id="calculator">50 * 36</gadget>
<output>1_800</output>

<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">50 * (6/5)</gadget>
<output>60</output>

<gadget id="calculator">1_800 / 60</gadget>
<output>30</output>

<result>30</result>