AMSL and skiing

Tomas skis from point A (3200m above sea level to place B. Hill has 20% descent. The horizontal distance between the start and finish is 2,5km. At what altitude is point B?

Correct result:

B =  2700 m AMSL

Solution:

$$\begin{gathered} A=3200\text{ m } \\ p=20\mathrm{\%}={\displaystyle \frac{20}{100}}=0.2 \\ x=2.5\text{ km}\to \text{ m}=2.5\cdot 1000\text{ m}=2500\text{ m } \\ B=A-p\cdot x=3200-0.2\cdot 2500=2700\text{ mAMSL} \end{gathered}$$

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