A new accountant at Skysong, Inc. is trying to identify which of the amounts shown below should be reported as the current asset

"Cash and cash equivalents" in the year$-$end balance sheet, as of April $30,2025.$

$$84$ of currency and coin in a locked box used for incidental cash transactions.

A $$11,800$ U$.$S$.$ Treasury bill, due May $31,2025.$

$$335$ of April$-$dated checks that Skysong has received from customers but not yet deposited.

An $$84$ check received from a customer in payment of its April account, but postdated to May $1.$

$$5,250$ in the company's checking account.

$$6,440$ in its savings account.

$$56$ of prepaid postage in its postage meter.

A $$24$ IOU from the company receptionist.

$($a$)$ What balance should Skysong report as its "Cash and cash equivalents" balance at April $30,2025?$