(4)If the Central Government fails to tender under sub-section (1) or deposit under sub-section (2) or sub-section (3) the whole or any part of the compensation required to be tendered or deposited thereunder within thirty days of the date on which the immovable property to which the compensation relates becomes vested in the Central Government under sub-section (4) of section 269-I, the Central Government shall be liable to pay simple interest at the rate of [fifteen per cent.] [ Substituted by Act 67 of 1984, Section 24, for " twelve per cent." (w.e.f. 1.10.1984).] per annum reckoned from the day immediately following the date of expiry of the said period up to the date on which it so tenders or deposits such compensation or, as the case may be, such part of the compensation.