There are two kinds of fruit for sale, mangoes are 6 kg per box, priced at 72 yuan; apples are 4 kg per box, priced at 52 yuan, which fruit is cheaper? How much is it cheaper?
出售两种水果，芒果每箱6千克，售价72元；苹果每箱4千克，售价52元，哪种水果便宜一些？便宜多少元？
<gadget id="calculator">52 / 4</gadget>
<output>13</output>

<gadget id="calculator">72 / 6</gadget>
<output>12</output>

<gadget id="calculator">13 - 12</gadget>
<output>1</output>

<result>1</result>