The birth rate is 1,214%
So if it was before the babies were born, the population is at a value of 100% and we need to add 1,214%
By using cross multiplication:
I find x = 29 620 277,1
So lets say the population would then be 29 620 277 people. Subtract the original value from that. (Or you could just have used 1,214 instead of 101,214)
If that was after the babies were born, then the population is now at 100% + 1,214% = 101,214% and then we need to find what the population was at 100% to find the original amount of people, so that we can find the number of babies that were born.
x = 28 913 984 (I rounded it like above)
Now subtract this from the initial value to get the number of babies that were born.