Discuss the below problem:
Q: Timely Transport provides local delivery service for a number of downtown and suburban businesses. Delivery charges are based on distance and weight involved for each delivery: 10 cents per pound and 10 cents per mile. Also, there is a $40 handling fee per parcel.
a. Develop an expression that summarizes delivery charges.
b. Determine the delivery charge for transporting a 40-pound parcel 20 miles