By selling 33 metres of cloth, one gains the selling price of 11 metres. Find the gain percent

Here,
The selling price of 11m cloth is obtained as profit.
(S.P. of 33 m cloth) – (C.P. of 33 m cloth)= S.P pf 11 m cloth
The selling price of 22 m cloth = Cost Price of 33 m of cloth

Let the cost of each metre be Tk. 100.

Therefore,
the cost price of 22 m cloth = 22 × 100 = Tk. 2200 and
S.P. of 22 m cloth = Tk. 3300
Profit = 3300 - 2200 = 1100

Profit% = {(1100/2200) × 100}%
= 50%