5 cylinders are built successively, the first is 4 meters tall and the following cylinders are each 4 meters taller than the previous. If the perimeter is 10pi m, what is the total surface area of the 5 cylinders, excluding the bases of each cylinder?	Choose the correct choice from the following answers.
A) 725pi sq m  B) 1025pi sq m  C) 600pi sq m  D) 125pi sq m  E) 850pi sq m
s.a. = h x p + 2 x a   we need to excude the bottom area, so the formula becomes:   s.a. = h x p + a   p = 2 pi x r, so 10 pi = 2 pi x r   r = 5   since we have 5 cylinders with different heights the equation becomes   s.a. = ( 4 + 8 + 12 + 16 + 20 ) x 10pi + 5 x pi x r ^2   60 x 10 pi + 5 pi x 5^2   600 pi + 125 pi = 725 pi sq. m.   725pi sq mnswer is 725pi sq m
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5 cylinders are built successively, the first is 4 meters tall and the following cylinders are each 4 meters taller than the previous. If the perimeter is 10pi m, what is the total surface area of the 5 cylinders, excluding the bases of each cylinder?