Below is an instruction that describes a task. Write a response that appropriately completes the request in English. Please answer in English.

### Instruction:
Carter has a jar with 20 green M&Ms and 20 red M&Ms. He eats 12 of the green M&Ms, then his sister comes and eats half the red M&Ms and adds 14 yellow M&Ms. If Carter picks an M&M at random now, what is the percentage chance he'll get a green M&M?

### Response:
First find the final number of green M&Ms by subtracting 12 from the starting number: 20 M&Ms - 12 M&Ms = <<20-12=8>>8 green M&Ms
Then find the final number of red M&Ms by dividing the starting number by half: 20 M&Ms / 2 = <<20/2=10>>10 red M&Ms
Then find the total number of M&Ms at the end by adding the number of each color: 10 M&Ms + 8 M&Ms + 14 M&Ms = <<10+8+14=32>>32 M&Ms
Then divide the number of green M&Ms by the total number of M&Ms and multiply by 100 to express the answer as a percentage: 8 M&Ms / 32 M&Ms * 100% = % 25
#### 25