Problem: The price of petrol drops by 40%. As a result, one \gets 5 liters more when one purchases petrol for Tk. 100. What is the present and what was the previous price of petrol per liter?
View all: ICB BANK | OFFICER | WRITTEN QUESTION (MATH) SOLVE | 1997
Correct Answer: TK $\frac{40}{3}$
Explanation:
In 100 Tk, the price of petrol reduced = TK 40
So, Present Price of 5 liter petrol = 40 TK
So, Present Price of 5 liter petrol =$\frac{40}{5}$= 8 TK
Again, at 40% reduction, price of petrol = 100-40 = TK 60
As present price TK 60, former price was = 100 TK
As present price TK 8, former price was = $\frac{100\cdot8}{60}$ TK = TK $\frac{40}{3}$