Correct Answer: 36 TK

Explanation:

At 16.6666% reduction, the present cost = Tk. (100 — 16.6666)

= Tk. 83.3334

When present cost Tk. 83.3334 then past cost = Tk. 100

When present cost Tk. 75 then past cost = Tk. $\frac{100\cdot75}{83.3334} $

= 90 Tk.

So the current price of 5 bananas = Tk. (90 — 75) = Tk. 15

The current price of 5 bananas = Tk. 15

The current price of 1 banana = Tk. $\frac{15}{5} $

The current price of 12 bananas = Tk. $\frac{15\cdot12}{5} $

= 36 Tk.