To earn extra money in the summer, you grow tomatoes and sell them at the farmers' market for 30 cents per kg. By adding compost to your garden, you can increase your yield as shown in the table below. If compost costs 50 cents per kg and your goal is to make as much money as possible, how many kilograms of compost should you add?

KG of Kompost KG of Tomatoes

0 100

1 120

2 128

3 134

4 137

5 139

6 140