When multiplying two numbers, if the multiplicand increases by 8 and the multiplier remains unchanged, the product increases by 104; if the multiplicand remains unchanged and the multiplier increases by 2, the product increases by 14. So what is the original product.
两数相乘，若被乘数增加8，乘数不变，则积增加104；若被乘数不变，乘数增加2，则积增加14．那么原来的积是多少．
<gadget id="calculator">14 / 2</gadget>
<output>7</output>

<gadget id="calculator">104 / 8</gadget>
<output>13</output>

<gadget id="calculator">7 * 13</gadget>
<output>91</output>

<result>91</result>