Correct Answer - Option 3 :

\(6\dfrac{1}{4}\%\)
**Given:**

The selling price of 16 water bottles is equal to the cost price of 17 water bottles

**Formula used:**

Profit% = (Profit/C.P.) × 100

**Calculation:**

Let the C.P. of each water bottles be x

Then C.P. of 17 water bottles = 17x

According to the question, we have

S.P. of 16 water bottles = 17x

So, profit = C.P. of one water bottle = x

According to the formula, we have

Profit% = (x/16x) × 100 = 100/16 = \(6\dfrac{1}{4}\%\)

**∴ The required profit percent is \(6\dfrac{1}{4}\%\).**