Initial position = 9th step.
Final position = 1st step
Monkey Jumps up = 4 steps
Monkey Jumps down = 2 steps
First Jump = 9 – 4 = 5th step
Second Jumb = 5 + 2 = 7th step
Third Jump = 7 – 4 = 3th step
Fourth Jump = 3 + 2 = 5th step
Fifth Jump = 5 – 4 = 1st step
∴ Monkey took 5 Jumps to reach back