Final answer:
The Graves Corporation's net income for the month is calculated by subtracting the total expenses from the total revenue. The total revenue is $1,300, and the total expenses are $470 ($320 for supplies plus $150 for insurance), resulting in a net income of $830.
Step-by-step explanation:
To calculate the net income for Graves Corporation, we should account for the revenue earned and expenses incurred during the month. We start by identifying revenue from services, which is the sum of services paid in advance by customers and services billed to a customer, totaling $500 + $800 = $1,300. Next, we calculate the expenses for the month, which include the supplies expense adjusted for the supplies still on hand at the end of the month ($400 - $80 = $320) and the portion of the prepaid insurance that counts as an expense for the month ($600/4 months = $150). The net income is thus calculated as total revenue minus total expenses, or $1,300 - ($320 + $150) = $830.