Kapil bought 750 g potatoes at rupee 20 per kg and1l 500 ml milk at rupee 29 per litre. He gave a 100-rupee note to the shopkeeper . What balance did he get back ?

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Solution

Dear student,

$C o s t o f 1000 g p o t a t o e s = R s 20 C o s t o f 1 g p o t a t o e s = R s \frac{20}{1000} C o s t o f 750 g p o t a t o e s = R s \frac{20}{1000} \times 750 = R s \frac{1}{5} \times 75 \Rightarrow C o s t o f 750 g p o t a t o e s = R s 15 C o s t o f 1000 m l m i l k = R s 29 [u \sin g 1 l = 1000 m l] C o s t o f 1 m l m i l k = R s \frac{29}{1000} C o s t o f 1500 m l m i l k = R s \frac{29}{1000} \times 1500 [a s 1 l 500 m l = 1000 + 500 = 1500 m l] = R s \frac{29}{10} \times 15 = R s \frac{29}{2} \times 3 = R s \frac{87}{2} \Rightarrow C o s t o f 1500 m l m i l k = R s 43.5 T o t a l a m o u n t h e s p e n t = 15 + 43.5 = 58.5 A m o u n t h e g e t b a c k = 100 - 58.5 = R s 41.5$

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