Step 1 :Let's find the total income from each type of furniture:
Step 2 :Rocking chair income: \(8 \times 185 = 1480\)
Step 3 :Kitchen chair income: \(18 \times 85 = 1530\)
Step 4 :Kitchen table income: \(3 \times 115 = 345\)
Step 5 :Picnic table income: \(6 \times 245 = 1470\)
Step 6 :Now, let's sum up the incomes to find the gross income for the two months:
Step 7 :Gross income: \(1480 + 1530 + 345 + 1470 = 4825\)
Step 8 :\(\boxed{4825}\)