Given Data:

• Loss Percentage (Loss%) = 15%

To find the Selling Price (S.P.), we use the formula:

\[ \text{S.P.} = \text{C.P.} - \left( \text{C.P.} \times \frac{\text{Loss%}}{100} \right) \]

Calculation Steps:

1. Assume the Cost Price (C.P.) of the article is N100 (for simplicity).
2. Apply the formula with the given Loss%:   \[ \text{S.P.} = 100 - \left( 100 \times \frac{15}{100} \right) \]
3. Calculate the reduction due to loss:   \[ \text{S.P.} = 100 - 15 \]   The N15 is the monetary value of the 15% loss on the C.P.
4. Therefore, the Selling Price after accounting for the loss:   \[ \text{S.P.} = 85 \]

Now, let's find the ratio of the selling price to the Cost price:

1. Given C.P. = 100 and calculated S.P. = 85.
2. The ratio is \(\text{S.P.} : \text{C.P.} = 85 : 100\).
3. To simplify the ratio:- Divide both parts of the ratio by their Greatest Common Divisor (GCD), which is 5.- Thus, the simplified ratio becomes \(\frac{85}{5}: \frac{100}{5} = 17: 20\).
4. Conclusion:∴ The ratio of Selling Price to cost price is 17: 20.