The cost of $4kg$ Onion,$3kg$ wheat and $2kg$ rice is $\$60$. The cost of $2\;kg$ onion,$4\;kg$ wheat and $6\;kg$ rice is $\$90$. The cost of $6\;kg$ onion, $2\;kg$ wheat and $3\;kg$ rice is $\$70$. Find the cost of each item per kg by matrix method.

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