Expressed as a percentage, what proportion of the 8,000 million population in 2025 do the 1,500 Lower and <15 groups make up? Because all the values are in millions, you need only enter the values in the table to get the correct answers. Round your answers to one decimal place. 9.4% 3.1% 50% 25% 18.8% Combining what you have learned about fractions and percentages, imagine that of all the >64 age group people in 2025, 20% of them are over 80 years old, called octogenarians. Expressed as a percentage, what proportion of the 8,000 million people in 2025 will be octogenarians? Give your answer to one decimal place. O 7.5% 10.0% 2.5% 5.0%