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The town of Springfield, USA has a population of 9900 people. The population is growing at a rate of 
2.3% each year.
Which expression gives the town's population 5 years from now?
Choose 1 answer:
(A) 
9900*0.023^(5)
(B) 
9900+0.023^(5)
(C) 
9900(1+0.023)^(5)
(D) 
9900+(1+0.023)^(5)

The town of Springfield, USA has a population of 99009900 people. The population is growing at a rate of 2.3% 2.3 \% each year.\newlineWhich expression gives the town's population 55 years from now?\newlineChoose 11 answer:\newline(A) 99000.0235 9900 \cdot 0.023^{5} \newline(B) 9900+0.0235 9900+0.023^{5} \newline(C) 9900(1+0.023)5 9900(1+0.023)^{5} \newline(D) 9900+(1+0.023)5 9900+(1+0.023)^{5}

Full solution

Q. The town of Springfield, USA has a population of 99009900 people. The population is growing at a rate of 2.3% 2.3 \% each year.\newlineWhich expression gives the town's population 55 years from now?\newlineChoose 11 answer:\newline(A) 99000.0235 9900 \cdot 0.023^{5} \newline(B) 9900+0.0235 9900+0.023^{5} \newline(C) 9900(1+0.023)5 9900(1+0.023)^{5} \newline(D) 9900+(1+0.023)5 9900+(1+0.023)^{5}
  1. Exponential growth formula: To find the population after a certain number of years when it is growing at a constant percentage rate per year, we use the formula for exponential growth: P=P0(1+r)t P = P_0(1 + r)^t , where P0 P_0 is the initial population, r r is the growth rate as a decimal, and t t is the time in years.
  2. Convert growth rate to decimal: Convert the growth rate from a percentage to a decimal by dividing by 100100. The growth rate is 2.3%2.3\%, so in decimal form, it is 0.0230.023.
  3. Substitute values into formula: Substitute the given values into the exponential growth formula: P=9900(1+0.023)5 P = 9900(1 + 0.023)^5 . This will give us the population of Springfield 5 5 years from now.
  4. Evaluate expression for population: Evaluate the expression to ensure it matches one of the given options. The correct expression based on the exponential growth formula is 9900(1+0.023)59900(1 + 0.023)^5, which corresponds to option (C).

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