Unexplained investments.

69. Where in the financial year immediately preceding the assessment year the assessee has made investments which are not recorded in the books of account, if any, maintained by him for any source of income, and the assessee offers no explanation about the nature and source of the investments or the explanation offered by him is not, in the opinion of the Assessing Officer, satisfactory, the value of the investments may be deemed to be the income of the assessee of such financial year.