What will be the difference between a single discount of 30% on Tk. 2000 and 2 successive discounts of 15% and 15%?

30% discount = 30% of 2000 = Tk. 600
Now, if you offer two successive discounts of 15% each, it works out to
First discount of 15% = 15% of 2000
= Tk. 300
After discount value = Tk. 2000 - Tk.300
= Tk. 1700
Second discount of 15% = 15% of Tk. 1700
= {(15/100) × 1700}
= Tk. 255

Difference = 600 - (300+255)
= 600 - 555
= Tk. 45