Question

If 1.2 kg of sugar is rs 3.20 find the cost of 1 kg of sugar?

Answer 1

The cost of 1.2 kg of sugar is Rs.3.2
 or, 1200 grams = 320 paise              [∵ 1 kg = 1000 g and 100 paise = Re.1]
 or, 1 gram = 320/1200 paise
 or, 1000 grams = 320*1000/1200 paise
 or, 1000 grams = 320000/1200 paise
 or, 1000 grams = 1600/6 paise
 or, 1000 grams = 800/3 paise
 or, 1000 grams = 266.6666667 paise 
 or, 1 kg = Rs. 2.666666667              [∵ 1 kg = 1000 g and 100 paise = Re.1]

∴ The cost of 1 kg of sugar is Rs. 2.6666667.