A girl bought a Nepenthes plant for Tk. 1600 after getting a 20% discount. What was the original catalog price of the plant?

Question: A girl bought a Nepenthes plant for Tk. 1600 after getting a 20% discount. What was the original catalog price of the plant?

Solution:
20% discount,
If the catalog price is Tk. 100 then the purchased price = (100 - 20)
= Tk. 80

Now,
If the purchase price is Tk. 80, the catalog price = 100 taka.
∴ If the purchase price is Tk. 1, the catalog price = 100/80 taka
∴ If the purchase price is Tk. 1600, the catalog price = (100 × 1600)/80
= Tk. 2000

∴ the original catalog price of the plant is Tk. 2000