1. **Stating the problem:** We have a mapping of percentages to a new scale:
- 85.5% maps to 0%
- 90% maps to 100%
- 94.5% maps to 200%
We want to find the value that corresponds to 93.1% on this new scale.
2. **Understanding the problem:** This is a piecewise linear mapping with two segments:
- From 85.5% to 90% corresponds to 0 to 100
- From 90% to 94.5% corresponds to 100 to 200
We need to find where 93.1% fits and then interpolate accordingly.
3. **Check where 93.1% lies:** Since 90% < 93.1% < 94.5%, it lies in the second segment.
4. **Formula for linear interpolation:** For a segment from $(x_1,y_1)$ to $(x_2,y_2)$, the value $y$ at $x$ is:
$$
y = y_1 + \frac{y_2 - y_1}{x_2 - x_1} (x - x_1)
$$
5. **Apply to second segment:**
- $x_1 = 90$, $y_1 = 100$
- $x_2 = 94.5$, $y_2 = 200$
- $x = 93.1$
Calculate slope:
$$
\frac{200 - 100}{94.5 - 90} = \frac{100}{4.5} = \frac{100}{4.5}
$$
Calculate $y$:
$$
y = 100 + \frac{100}{4.5} (93.1 - 90) = 100 + \frac{100}{4.5} \times 3.1
$$
6. **Simplify:**
$$
y = 100 + \frac{100 \times 3.1}{4.5} = 100 + \frac{310}{4.5}
$$
7. **Calculate final value:**
$$
y = 100 + 68.888\ldots = 168.888\ldots \approx 168.89
$$
**Final answer:** The value corresponding to 93.1% is approximately **168.89** on the new scale.
Percentage Mapping 68D9Ad
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