The Supreme Court today raised question on how Sahara transacted thousands of crores in cash with its sister firms for refunding 20,000 crore rupees to its investors.A bench of justices K S Radhakrishnan and J S Khehar asked market regulator SEBI to find out whether the Company Law and the RBI guidelines allow cash transactions of such large amount of money. SEBI has alleged that no bank statement was furnished by the group to show the money trail, which Sahara claims to have refunded to investors.