Meaning of letters and symbols:
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K
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is the number of a loan
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K′
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is the number of a repayment or a payment of charges
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AK
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is the amount of loan number K
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A′K′
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is the amount of repayment number K′
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represents a sum
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m
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is the number of the last loan
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m′
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is the number of the last repayment or payment of charges
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tK
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is the interval, expressed in years and fractions of a year, between the date of loan No. 1 and those of subsequent loans Nos. 2 to m′
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tK′
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is the interval expressed in years and fractions of a year between the date of loan No. 1 and those of repayments or payments of charges Nos. 1 to m1
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i
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is the percentage rate that can be calculated (either by algebra, by successive approximations, or by a computer programme) where the other terms in the equation are known from the contract or otherwise.
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