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Find the value of the following expression and round to the nearest integer:

sum_(n=0)^(98)300(0.96)^(n-1)
Answer:

Find the value of the following expression and round to the nearest integer:\newlinen=098300(0.96)n1 \sum_{n=0}^{98} 300(0.96)^{n-1} \newlineAnswer:

Full solution

Q. Find the value of the following expression and round to the nearest integer:\newlinen=098300(0.96)n1 \sum_{n=0}^{98} 300(0.96)^{n-1} \newlineAnswer:
  1. Find First Term: We are given a geometric series with the first term a=300(0.96)1a = 300(0.96)^{-1} and the common ratio r=0.96r = 0.96. The sum of a finite geometric series can be found using the formula Sn=a(1rn)/(1r)S_n = a(1 - r^n) / (1 - r), where nn is the number of terms. First, we need to find the first term aa.\newlinea=300(0.96)1a = 300(0.96)^{-1}\newline=300/0.96= 300 / 0.96\newline=312.5= 312.5
  2. Calculate Number of Terms: Next, we calculate the number of terms in the series. Since the series starts from n=0n=0 and goes to n=98n=98, there are 9999 terms in total.
  3. Use Sum Formula: Now we can use the sum formula for a geometric series to find the sum S99S_{99}. \newlineS99=a(1rn)(1r)S_{99} = \frac{a(1 - r^n)}{(1 - r)}\newline=312.5(10.9699)(10.96)= \frac{312.5(1 - 0.96^{99})}{(1 - 0.96)}
  4. Calculate Numerator: We calculate the numerator of the fraction, which is 10.96991 - 0.96^{99}. 10.96991a very small number1 - 0.96^{99} \approx 1 - \text{a very small number} Since 0.96990.96^{99} is a very small number, we can approximate this to 11 for the purpose of simplification.
  5. Calculate Denominator: Now we calculate the denominator of the fraction, which is 10.961 - 0.96. \newline10.96=0.041 - 0.96 = 0.04
  6. Find Sum: We can now find the sum S99S_{99} by dividing the numerator by the denominator.\newlineS99312.50.04S_{99} \approx \frac{312.5}{0.04}\newline=312.5×25= 312.5 \times 25\newline=7812.5= 7812.5
  7. Round to Nearest Integer: Finally, we round the sum to the nearest integer. 7812.57812.5 rounded to the nearest integer is 78137813.

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