5 km long road begins at an altitude 500 meters above sea level and ends at a altitude 521 ASL. How many permille road rises?

Correct result:

p =  4.2

#### Solution:

$y=521-500=21 \ \text{m} \ \\ x=5 \ km \rightarrow m=5 \cdot \ 1000 \ m=5000 \ m \ \\ \ \\ p=1000 \cdot \ \dfrac{ y }{ x }=1000 \cdot \ \dfrac{ 21 }{ 5000 }=\dfrac{ 21 }{ 5 }=4.2 \ ‰$

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