Trouble with Basic Math Formula. Anyone Help?

Question

I have this question for a chem class. Here is the question.

The bulk of human food is provided by eight grains (wheat, rice, corn, barley, oats, sorghum, millet and rye). Current world grain production is about 1.8 Billion metric tons, which is enough to feed about 8.1 Billion people. Assume for the sake of this problem that grain is the only food we eat. If the world's production of food is increasing linearly at 1.4% per year, how many people will be able to be fed at the time the world's population has doubled?
A. 10.0 Billion
B. 14.2 Billion
C. 620 Billion
D. I think it should be more than 12 Billion, but I don't get answer B or C

E. I think it should be less than 12 Billion but I don't get answer A

Now I have a formula that gave me how much food will be produced. The answer is 3,060,000,000. Now I need to figure out how to convert that to how many people that number can feed. Any ideas? Thaaanks.

The doubling time is 50 years.

Answer 1

Now:
food: 1.8 bil

1 year from now:
food: (1.8) + (1.8 * 1.4%)

2 years from now:
(1.8) + (1.8 * 1.4%) + (1.8 * 1.4%)
= (1.8) + 2(1.8 * 1.4%)

So the amount of food you have x years from now would be
(1.8) + x(1.8 * 1.4%)

I don't have the information on how long it will take to double the population, so I can't go much further than that... You would just calculate the above expression for x = the number of years it takes to double the population.

Answer 2

16.23 billion people. Each year the production rate increases by a factor of 1.014. In 50 years you have an increase of 1.014^50, almost exactly 2. (Look up the "rule of 70" some time.) This means
1.014^50 * 8.1 bil = 16.23 bil people fed, or
1.014^50 * 1.8 bil = 3.607 bil tonnes.

Answer 3

I must be missing something, but I think we need to know how many years it will take for the population to double.

Answer 4

The tax value ought to be 7% or it ought to be .07 as a fragment, whether it ought to not be 0.07% a minimum of not on the North American continent. the effort-free thank you to be certain the quantity of taxes is very final invoice / ( a million + tax value as a decimal) 1500 / (a million.07) = 1401.87

Answer 5

need some assumption about current population level and its future growth (to double)