Martha Green owns and operates Twigs Tree Trimming Service. Martha graduated from the forestry program and worked for a large landscape design firm that performs tree trimming and removal. After several years of experience, she bought her own truck, stump grinder, and other equipment and then opened her own business in St. Paul, Minnesota.

Although many of her jobs are one-time operations to remove a tree or stump, others are recurring: trimming a tree or group of trees every year or every other year. When business is slow, she calls former clients to remind them of her service and of the need to trim their trees on a regular basis.

Martha keeps the following data about each of her jobs:

OwnerName, Phone, Street Address, City, State, Zip, DateOfService, Description, AmountBilled, AmountPaid, DateOfPayment.

Assume that Martha stores this data as a list in a spreadsheet. The following is just a sample of her more than 600 job records.

Bob Black	612 6578900	670 Pine Tree Road	St. Paul	MN	55113	3/4/19	5 trees removed	$400	$200	5/10/19
Bob Black									$100	6/10/19
Bob Black									$100	7/20/19
Jenny Love	612 2349032	234 A Street	St. Paul	MN	55118	1/7/20	3 tree trimmed	$120	$120	2/1/20
Chris Winter	320 4536789	267 4th Ave.	St. Paul	MN	55103	8/4/20	2 stumps removed	$78	$78	9/15/20
Jenny Love	612 2349032	234 A Street	ST. Paul	MN	55118	10/2/20	2 trees trimmed	$126	$50	10/2/20
Jenny Love									$76	11/5/20
Dan Tan	320 6564568	2345 Oak Tree Street	St. Paul	MN	55103	12/7/20	5 tree stumps removed	$300	$100	12/7/20
Dan Tan									$200	1/10/21

1. Describe potential problems Martha can have when storing the data in this manner.
2. If you develop a relational database for Martha, how many tables would you use in order to eliminate the problems? Draw the table structures you would recommend. And show records in each table.