(4) 125%
We know that the CP for 3 bananas = ₹2
CP for 1 banana = ₹2/3
SP for 2 bananas = ₹3
SP for 1 banana = ₹3/2
Since SP is more than CP its Gain
Gain = SP – CP
= 3/2 – 2/3
= 5/6
∴ Gain% = (Gain × 100) /CP
= ((5/6) × 100) / (2/3)
= 5/4 × 100
= 125%