On June 10, 2016, Mr. Roger agreed to buy a plot of land at BKK from Mr. Harry for 2.5 million Baht. Both of Mr. Roger and Mr. Harry promised to enter into a sale contract on July 10, 2016 and Mr. Roger agreed to pay a purchase price at this time. This agreement was made in writing.
(c) What kind is this sale contract? Why?
(d) What should Mr. Harry do if on July 10, 2016 Mr. Roger did not make the payment on the sale contract of a plot of land at BKK? Why?