From the question,
Sudhir bought an almirah for = ₹13,600 = cost price
Transportation cost = ₹400
The total cost price of almirah = ₹(13600 + 400)
= ₹14,000 [1 Mark]
He sold it for = ₹16,800 = Selling price
By comparing SP and CP = SP > CP, so there is a gain
Gain = SP – CP
= 16,800 – 14,000
= ₹2,800 [1 Mark]
Gain % = {(gain/CP) × 100}
= {(2800/14000) × 100}
= {2800/140}
= 20% [1 Mark]
So there is a gain of 20%.