Rex who was a bachelor gave Pita a promisory note of US$25, 000 as payment for land. Pita felt that he overcharged Rex, so he asked Abusu who had possession of the promissory note to write on the back of it ‘reduced to US$10, 000’. Last week Pita had an accident and died. The executor of Pita’s estate sued for the full value of the promissory note. Advise all parties as to their interests and entitlements.