Murlidhar, who owns a grocery store, runs a discount offer: "Buy 5 water bottles and get 1 additional bottle free." What is the effective percentage discount given by Murlidhar? (Round your answer to two decimal places.)

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**Solution:**

1. Let the price of one water bottle be $P$.

2. Under the offer, when a customer buys 5 bottles, they receive 1 bottle free, so they get 6 bottles for the price of 5.

3. The total value of 6 bottles is $6P$, but the customer pays only for 5 bottles, i.e., $5P$.

4. The discount amount is the price of the free bottle, which is $P$.

5. Calculate the effective discount percentage using the formula:

$$\text{Discount Percentage} = \frac{\text{Discount Amount}}{\text{Total Value}} \times 100 = \frac{P}{6P} \times 100 = \frac{1}{6} \times 100 = 16.67\%$$

**Answer:** 16.67\%

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