Let us consider the CP of 17 water bottles = ₹100
∴ The CP of 17 water bottles = SP of 16 water bottles = ₹100
SP of 17 water bottles = (100/16) × 17 = ₹106.25
Since, SP is more than CP so it’s a gain.
Gain = SP – CP = 106.25 – 100 = ₹6.25
Gain % = (Gain × 100) / CP
= (6.25 × 100) / 100
= 6.25%
∴ The Gain percent is 6.25%