When calculating global population growth, the death rate is

When calculating global population growth, the death rate is subtracted from the birth rate

Using just these variables, Population growth = Population*(Birth rate - Death rate). However, a couple of real-life refinements: 1. Although the number of births and deaths …depends on the population, it is related to the age-structure of the population. A very old population, for example, will not have many births but many deaths whereas a young population will have more births and fewer deaths. So, the population should be stratified according its age structure. 2. Net migration also needs to be taken into account.      

Isuck at math i am no sorry