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Getachew and his son Yonathan agree to paint a house for 600 Birr. After working together for 10 days, the job is 5/8 finished, and

Getachew and his son Yonathan agree to paint a house for 600 Birr. After working together for 10 days, the job is 5/8 finished, and Getachew leaves Yonathan to finish the job alone, which he does in 18 more days. How much is Yonathan’s share?

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