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10 units earn a profit of 5 in 2 months
that means
1 unit earns a profit of 0.5 in 2 months
1 unit earns a profit of 0.25 in 1 month
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8 units earn a profit 8*0.25=2 in 1 month
8 units earn a profit of 3*2=6 in 3 months
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