Note 6 - Investment in account receivable

On April 10, 2015, the Company entered into an exchange agreement whereby the Company received an investment in an account receivable with installment payments of $117,000 per year for 11 years totaling $1,287,000 in exchange for 757,059 shares of Mentor Common Stock obtained through exercise of Series D warrants at $1.60 per share. 

The Company valued the transaction based on the market value of Company common shares exchanged in the transaction, resulting in a 17.87% discount from the face value of the account receivable.  The discount is being amortized monthly to interest over the 11 year term of the agreement.  The April 10, 2015 investment in account receivable is supported by an exchange agreement and consisted of the following:

For the three months ended March 31, 2018 and 2017, $14,952 and $23,601 of discount amortization is included in interest income, respectively.