The manager of a local fruit shop found that during a typical day, the following amounts of fruit were sold: 18 kg of Apples, 20 kg of Oranges and 13 kg of Bananas. If each kilo of fruit is sold for $2.7, $3.7 and $4.1 respectively, find the weighted average revenue per kilogram ($/kg) for the fruit shop. Give your answer correct to two decimal places.