**Why

Subtract the discount from the total cost:

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80% of the volume is \( 0.8 \times 45\pi = 36\pi \) cubic meters.
Therefore, the water volume in the tank is approximately \( 36 \times 3.1416 = 113.0976 \) cubic meters.
The sum of the first \( n \) terms of an arithmetic sequence is given by \( S_n = \frac{n}{2} (2a + (n-1)d) \). If the first term \( a = 5 \) and the common difference \( d = 3 \), find the sum of the first 15 terms.

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