Nationwide Communications offers its customers a monthly plan for text messaging. Customers under this plan pay a flat rate of $5.00 each month for up to 250 text messages. For each additional text message over 250 (up to 2000 messages), the customer will pay $0.10. For each message over 2000 messages, the customer will pay $0.40. Complete the piecewise function that can be used to calculate the monthly billing amount, B, for a monthly level of t text messages. Note: Use the letter t as your variable.