This section applies where a claim is made under this Chapter and, at any time during the period beginning on the date of the death and ending four months after the last of the sales referred to in section 191(1) above, the person making the claim purchases any interests in land in the same capacity as that in which he makes the claim.
If the aggregate of the purchase prices of all the interests purchased as mentioned in subsection (1) above equals or exceeds the aggregate of the sale prices (as adjusted under sections 193 to 195 below) of all the interests to which the claim relates, this Chapter shall not apply in relation to the claim; but otherwise subsection (3) below shall have effect, and in that subsection "the appropriate fraction" means the fraction of which—
Subject to subsection (4) below, where this subsection has effect an addition shall be made to the sale price of every interest to which the claim relates; and the amount of the addition shall be equal to the appropriate fraction of the difference between the value on death of the interest and its sale price (as adjusted under sections 193 to 196 below).
Where the value on death of an interest is less than its sale price (as adjusted under sections 193 to 196 below) subsection (3) above shall apply as if it provided for a reduction instead of an increase in the sale price.