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A milkman bought 120 litres of milk at rs.16 per litre .At what price should he sell the milk to make a gain of rs.180?

$G i v e n, m i l k m a n b o u g h t 120 l i t r e s o f m i l k a t R s 16 p e r l i t r e . S o, C o s t p r i c e o f 120 l i t r e s o f m i l k = 120 \times 16 = R s 1920 L e t S . P . o f 1 20 l i t r e s o f m i l k = R s x W e k n o w t h a t, G a i n = (S . P .) - (C . P .) \Rightarrow 180 = x - 1920 \Rightarrow x = 1920 + 180 \Rightarrow x = 2100 T h e r e f o r e, S . P . o f 1 20 l i t r e s o f m i l k = R s 2100 S o, S . P . o f 1 l i t r e o f m i l k = \frac{R s 2100}{120} = R s 17.5 p e r l i t r e H e n c e, h e s h o u l d s e l l t h e m i l k a t R s 17.5 p e r l i t r e t o m a k e g a i n o f R s 180.$

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