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A special tonic is prepared by mixing the liquid extracts of four different kinds of herbs; A, B, C and D.
The above extracts are used in the ratio 6 : 7 : 8 : 9 respectively.
72 ml of herb A cost $90.
84 ml of herb B cost $63.
Herb C cost $96 for 64 ml and 108 ml of herb D cost $108.
What is the cost of preparing 3 litres of the tonic?