Radius \( r = \frac{10}{2} = 5 \) meters.
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- Cost of paint: \( 5.338 \times 15 = 80.07 \).
- #### $80.07
- A spherical tank has a diameter of 10 meters. If it is filled to 80% of its capacity, what is the volume of water in the tank? Use \( \pi \approx 3.14 \).
- Volume of sphere: \( \frac{4}{3}\pi r^3 \).
- Volume: \( \frac{4}{3} \times 3.14 \times 5^3 = \frac{4}{3} \times 3.14 \times 125 = \frac{1570}{3} \approx 523.33 \) cubic meters.
- Water volume at 80%: \( 0.8 \times 523.33 \approx 418.664 \) cubic meters.
