The product of two one-digit decimals is 13.7 after "rounding off". The tenths of these two one-digit decimals are both 7. What is the product of these two decimals before rounding off?
两个一位小数的乘积"四舍五人"后是13.7，这两个一位小数的十分位都是7，这两个小数的乘积在四舍五入前是多少？
<result>13.69</result>