1. Calculate the percentage increase in calories in developing countries and industrialised countries from 1964 to 2030.Developing countries - the change is from 2054 to 2980 so...2980 - 2054 = 926 kcal per day is the change.to find percentage increase you need to divide the change by the original amount and multiply by 100 to convert to a %, so...(926/2054)*100 = 45.08% (answer to 2 d.p.)