Question

the price of salt was ₹18 per kg if it increase first by 20%and then by 20% what is the new cost of salt​

Answer 1

Answer:

Let the original price per kg is x Rs

Reduced price is 0.8x

So

100/0.8x−100/x=4

x=25/4

So reduced price 0.8∗x=5 Rs/kg

Conceptual way

20% of 100 = 100∗(20/100)=20 Rs will be saving. But instead of this he bought extra 4 kg salt.

New price = 20/4 = 5 Rs/kg