I know the final answer to physics problem below about the exhaust speed. Please...

...give me the solution? A rocket, starting from rest in deep space, with an initial mass of M and a final mass of 0.2 M attains a speed of 3200 m/s. What is the exhaust velocity of the rocket?

I know the answer is 2000 m/s, I just need the solution. please help me.

(Please give me serious answers, and do not tease me please)
 
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