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R equals P times I over 1 minus one plus I to the power of minus T
Where
where—
P is the premium payable as a condition of the grant of the tenancy (and includes a payment of money’s worth) or, where no premium is so payable, zero,
I is 0.06, and
T is the term, expressed in years, granted by the tenancy (disregarding any right to terminate the tenancy before the end of the term or to extend the tenancy); and]

This is what the green box with an X on it is on your PC for

OK?

(Or just pass it to your LCD / small child - (s)he wil know some maths)