Code in C++

3.21 LAB: Mobile Phone A mobile phone service provider offers the following voice plans: Package A: 450 minutes for $39.99..45/minute for each additional minute. Package B: 900 minutes for $59.99.40/minute for each additional minute. Package C: Unlimited minutes for $69.99. Output the following menu to prompt the user for the customer's cell phone plan and monthly minutes: Rate Plans: A. The 450 minute plan B. The 900 minute plan C. The unlimited plan Enter the letter of the rate plan and the number of minutes used in the month: Then compute the customer's monthly bill and display the total amount due with a dollar sign and formatted to 2 decimal places Ex: If the input is: B 875 the output is: $59.99 Ex: If the input is: A 550 the output is: $84.99 Ex: If the input is: D 550 the output is: Invalid Rate Plan