#### 340
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- \[ C = 2 \times 3.14 \times 7 = 43.96 \]
- \[ V = 5 \times 8 \times 10 = 400 \, \text{cm}^3 \]
- \[ SA = 2(5 \times 8 + 5 \times 10 + 8 \times 10) = 2(40 + 50 + 80) = 2 \times 170 = 340 \, \text{cm}^2 \]
- \[ x - 2 = 0 \implies x = 2 \]
- \[ x - 3 = 0 \implies x = 3 \]
- \[ \text{Increase} = 0.12 \times 250 = 30 \]
