Correct Answer: The original price Tk. 50 and the current price Tk. 40.

Explanation:

In Tk. 100 decreases = Tk. 20

In Tk. 800 decreases = Tk.$\frac{20\cdot 800}{100}$
$\frac{20 \cdot 800}{100}$
= Tk. 160

The current price of 4 meters is Tk. 160

The current price of per meters is Tk. (160 / 4) = Tk. 40

At a reduction in price by 20%,

The current price = Tk. (100 — 20) = Tk. 80

The original price of per meter of cloth = $\frac{100\cdot 40}{80}$
$\frac{100 \cdot 40}{80}$
= Tk. 50