20. A real-time system has 3 periodic tasks: T1 (period=50ms, execution=10ms), T2 (period=100ms, execution=20ms), T3 (period=200ms, execution=40ms). Using Rate Monotonic Scheduling, what is the CPU utilization?
(A) 60%
(B) 70%
(C) 80%
(D) 90%
(E) 100%

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