Parenting Group Farms grew pumpkins in three different sizes of garden plots: small, medium, and large. In a small plot they grew two pumpkin plants, in a medium plot they grew four pumpkin plants, and in a large plot they grew six pumpkin plants. This year, they are planning to grow butternut squash instead of pumpkins. In each small plot they will grow three butternut squash plants, in each medium plot they will grow six butternut squash plants, and in each large plot they will grow nine butternut squash plants. The farm has 10 small plots, 16 medium plots, and 8 large plots.

How many pumpkin plants did the farm grow last year?

How many butternut squash plants are they expecting to grow this year?

If the farm can sell a pumpkin for $4 and a butternut squash for $3, how much more money will they make this year compared to last year?

If the farm can only sell a maximum of 100 pumpkins and 150 butternut squash, which type of plant should they grow more of next year to maximize their profit?