shall be liable to the person purchasing the security from the seller to recover the consideration paid for the security, together with interest at the legal rate from the date of payment, less the amount of any income received on the security, upon the tender of the security, or, if the purchaser no longer owns the security, the amount that would be recoverable upon a tender, less the value of the security when the purchaser disposed of it and interest at the legal rate from the date of disposition.