A cylindrical oil tank has a radius of 5 m and a total surface area of 628 m² what would be its curved surface area ? (round off to the second decimal place)

Correct option is C

Given:
Radius of cylindrical tank =5m
Total surface area of tank = 628
Formula Used: 

Curved surface area = $$2\pi rh$$ 

Total surface area = $$2\pi r^2 + 2\pi rh$$​​
Curved surface area = Total surface area - (Area of circle of top and bottom of tank)
Solution:
CSA = 628 - 2$$\pi$$​ $$r^2$$​​
​$$= 628 - 2 \times \frac{22}{7}\times 25 \\\ \\= 628- 157.14 \\\ \\= 470.85$$​​