Make the price of salt reasonable

Just a few months ago, the price of refined salt was Taka 25 per kg. Now the price has gone up to Taka 35-40. What is the reason behind this price hike? Is there suddenly a scarcity of salt in the market? We are drawing the attention of the authority concerned to look into this matter seriously.
Mohd. Ashraf Hossain
Central Bashabo,Dhaka