Given the following data:

a$.$ Determine the cash receipts for April based on the following data:

Cash payments during April

Cash account balance, April $1$

Cash account balance, April $30$

$$40,380$

$3,030$

$7,630$

b$.$ Determine the cash received from customers on account.

Accounts receivable account balance, April $1$

Accounts receivable account balance, April $30$

Fees billed to customers during April

$

$$11,380$

$7,870$

$28,160$