A shopkeeper is selling a gift packet of fruits in which he is mixing apples and mangoes. The packet contains a total of 12 kg of fruits at an average rate of 100 per kg. In the packet there are 8 kg of apples at the rate of ₹90 per kg, while there are 4 kg of mangoes at the rate of X per kg. Find the value of 'X'.

Note: All other charges are to be ignored for packing.