Represent the following problem by a system of equations:
"240 is the cost of 5 kg of sugar, 5 kg of wheat and 2 kg of rice. The cost of 4 kg rice, 2 kg sugar and 5 kg wheat is 190. The cost of 3 kg wheat, 2 kg rice and 4 kg sugar is 190." Use the determinants to find the cost of each per kg.
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