The total circumference of two circles is 88. If the first circle has a circumference that is exactly twice the circumference of the second circle, then what is the approximate sum of their two radii? Choose the correct choice from the following:  A) 5.7  B) 6.0  C) 6.7  D) 9.7  E) 14.0

Rationale: "let r = radius of smaller circle . let r = radius of larger circle therefore : 2 π r + 2 π r = 88 where 2 r = r thus : 2 π r + 4 π r = 88 6 π r = 88 r = approx 4.7 π r + 2 r π = 88 3 π r = 88 r = approx 9.3 r + r = approx 14.0 answer : e"
Answer: E