Question 1 (10%) Khun Keng agreed to write a computer software program entitled "The Battle Side" for James at the purchase price of 20,000 Baht. James paid a deposit 10,000 Baht. When the program of was ready, Khun Keng delivered the software program to James. Upon receiving the software program, James leased the software program to Martin whereby Martin agrees to pay James a monthly rental of 2,000 Baht. Yesterday afternoon Martin got involved in a bad motorcycle accident and died. Khun Keng now demands James to pay up the remaining balance of 10,000 Baht of the purchase price. James said to Khun Keng that he cannot pay Khun Keng because there was no written sell and purchase agreement, therefore no sell and purchase agreement. Furthermore, since Martin is now dead, James is not receiving any rent payment so James does not have money to pay Khun Keng. What should Khun Keng do now? and why?