 There may also be more than one real solution to the equation, requiring some interpretation to determine the most appropriate one.Note that the money-weighted return over multiple sub-periods is generally not equal to the result of combining together the money-weighted returns within the sub-periods using the method described above, unlike time-weighted returns.The value of an investment is doubled if the return formula_51 = +100%, that is, if formula_25 = ln($200 / $100) = ln(2) = 69.3%.