Murlidhar, the owner of a grocery store, offers a discount scheme 'buy 5 water bottles get 1 for free' to his customers. What is the **effective percentage discount** offered by Murlidhar? (correct up to two decimal places)

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**Solution:**

1. According to the scheme, when a customer buys 5 water bottles, they get 1 additional bottle free.

2. Total quantity received = 5 (paid) + 1 (free) = 6 bottles.

3. Discounted quantity = 1 bottle (free bottle).

4. Effective percentage discount is calculated as:

$$	ext{Effective percentage discount} = \frac{	ext{Discounted quantity}}{	ext{Total quantity}} 	imes 100 = \frac{1}{6} 	imes 100 = 16.67\%$$

**Answer:** 16.67\%

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