SAP, Inc. has a beginning receivables balance on January $1$ of $$390.$ Sales for January through April are $$520,$$$580,$$$640,$ and $$540,$ respectively. The accounts receivable period is $30$ days. How much did the firm collect in the month of February? Assume that every month has $30$ days.

$$520$

$$540$

$$560$

$$580$

$$640$