# Conserving water

Calculate how many euros are spent annually on unnecessary domestic hot water, which cools during the night in pipeline. Residential house has 129 m of hot water pipelines 5/8" and the hot water has a price of 7 Eur/m3.

Correct result:

p =  65.2 Eur

#### Solution:

$p = 365 \cdot \pi (\dfrac{ 2.54 \cdot 5/8}{ 2 \cdot 100})^2 \cdot 129 \cdot 7 = 65.2 \ \text{Eur}$

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