2 years ago in Table Chart

In what proportion P, Q and S should be mixed to make a diet having least 60% carbohydrate at the lowest per unit cost?

[A] 2 :1 :3
[B] 4 :1 :2
[C] 2 :1 :4
[D] 3 :1 :2
[E] 4 :1 :1
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