In what ratio must a vendor mix two varieties of sugar worth ` 60 per kg and ` 78 per kg so that by selling the mixture at ` 78 per kg, the vendor gains 20%?

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In what ratio must a vendor mix two varieties of sugar worth ` 60 per kg and ` 78 per kg so that by selling the mixture at ` 78 per kg, the vendor gains 20%?