Which of the following is an example of a variable consideration? John is expected to receive $100 for his tutoring services provided that he keeps track of his hours Melody's Piano will get paid for the 50 pianos sold provided that the pianos are non-defective after the customer takes control. C.Cantankerous Computers gets paid a base amount for every repair plus an additional hourly fee of $10. Excellent Electronics has a 10% mall in rebate program for the Model X-001 speaker system. The company sold $10,000 worth of systems and believes there OD. is a 50% chance that rebates will be redeemed