Answer: 56%
Explanation:
Pot A
75% = 0.75
12 times 0.75 = 9 seeds sprouted
Pot B
50% = 0.5
20 times 0.5 = 10 seeds sprouted
Pot C
50% = 0.5
18 times 0.5 = 9 seeds sprouted
Add total; we get 28 seed sprouted
Then we take 28 divided by 50, times 100% = 56%
So, 56% of the seeds from the packet sprouted!