Your original investment in a start-up company was $4200
Let you invested x dollars in a start-up company.
Now your investment has gained 60% and is worth $6,720.
We write above statement as a mathematical expression.
From given information, x + (60 percent of x) = 6720
So we get an equation,
x + (0.6 x) = 6720
We solve above equation for x.
1.6 x = 6720
x = 6720 / 1.6
x = 4200 dollars
This means, initially you invested $4,200
Therefore, your original investment in a start-up company was $4200
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