# The incremental rate of return additional investment in alternative B.

The incremental rate of return additional investment in alternative B.
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Calculation:
Write the expression to calculate the additional investment for alternate B.
$0=-\left(I2-I1\right){\left(1+i\right)}^{n}+\left(Y-X\right)\left(\frac{{\left(1+i\right)}^{n}-1}{i}\right)+\left(S2-S1\right)$ ......(I)
Rewrite Equation (I).
$0=-\left(I2-I1\right)\left(\frac{F}{P},i,6\right)+\left(Y-X\right)\left(\frac{F}{A},i,6\right)+\left(S2-S1\right)$.
Conclusion:
(c) $0=-\left(I2-I1\right)\left(\frac{F}{P},i,6\right)+\left(Y-X\right)\left(\frac{F}{A},i,6\right)+\left(S2-S1\right)$.