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'A' can do 50% of work in 10 days, whereas 'B' can do 25% of the same work in 8 days. 'A' and 'B' started the work, but 'B' left the work 'n' days before completion of work. If the whole work is completed in 15 days, then find the value of [0.8n + (n²/10) ].

A 10.5

B 18.5

C 24.2

D 5.5

E None of these

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