A fruit company ships a batch of fruits. 40% of the weight of apples is equivalent to 50% of the weight of pears. It is known that the weight of pears is 3.6 tons. How many tons are apples?
某果品公司运进一批水果，苹果重量的40%相当于梨重量的50%已知梨的重量是3.6吨，请问苹果是多少吨？
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(1/2) / (2/5)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">3.6 * (5/4)</gadget>
<output>4.5</output>

<result>4.5</result>