Chapter 3, Problem 3.9P

I am searching for a clear explanation of this financial accounting problem with valid methods.

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Rivana Co. has a beginning receivables balance on March 1 of $1,280. Sales for March through June are $790, $860, $1,150, and $2,050, respectively. The accounts receivable period is 30 days. What is the amount of the May collections? Assume a year has 360 days.