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Mathematics
23.11.2020 22:27
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Between 2005 and 2009, the average rate of inflation was about 4.8% per year. if

Between 2005 and 2009, the average rate of inflation was about 4.8% per year. if a cart of groceries cost $110 in 2005, what did it cost in 2009?
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cupcake3103670
cupcake3103670
5,0(79 marks)
\bf \qquad \textit{Amount for Exponential change}\\\\
A=P(1\pm r)^t\qquad 
\begin{cases}
A=\textit{accumulated amount}\\
P=\textit{starting amount}\to &110\\
r=rate\to 4.8\%\to \frac{4.8}{100}\to &0.048\\
t=\textit{elapsed period}\to &4\\
\end{cases}
\\\\\\
A=110(1+0.048)^4

the rate is positive, because is a rate of increase, from 2005 to 2009, is 4 years, 2005 being t = 0
photagraphykid
photagraphykid
5,0(5 marks)

Probability that a single student randomly chosen from all those taking the test scores 539 or higher is 0.5714.

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