Randy's Rentals reported the following on its year-end balance sheets:
........................December 31, 2017.....................December 31,2016
Current Assets:
Rent receivable.................$55,000...................................$35,800
Randy's rents space to a number of tenants, all of whom pay their monthly rent on the 10th of the following month. Randy's reported rent revenue for 2017 of $64,200.
Required
How much cash did Randy's collect from its tenants during 2017? Explain your answer.