Question

A reduction of 21% in the price of an item enables a person to buy 3 kg more for Rs 100.The reduced price of Item per kg is?

Answer 1

let's take the price of 1kg of item be x. then kgs of item bought for ₹100 is 100/x. when reduced by21% , price becomes 0.79x. kgs of item bought for ₹100 is 10000/79x. The difference in kgs of item bought is 3 kg. so 10000/79x-100/x=2100/79x =3. x=700/79=8.86 ruppees per kg that is the answer .