A college graduate expects to earn a salary of $50,000 during the first year after graduation and receive a 3% raise every year after that. What is the total income he will have received after ten years? A. $515,000.00 B. $507,955.31 C. $640,389.78 D. $573,193.97 SUBMIT

A college graduate expects to earn a salary of 50000 during the first year after graduation and receive a 3 raise every year after that What is the total income class=

Respuesta :

This problem is an example of a Geometric Progression (GP).

A GP usually has the following parameters to describe it:

[tex]\begin{gathered} a=\text{ First term} \\ r=\text{ Common ratio} \end{gathered}[/tex]

From our question, we have the first term to be 50000, and the common ratio is a 3% increase.

We know that if a percentage (p) is given, the actual ratio is given as

[tex]\begin{gathered} r=\frac{p}{100}+1\text{ (For increments)} \\ or \\ r=1-\frac{p}{100}\text{ (for reductions)} \end{gathered}[/tex]

Therefore, the common ratio in our case is

[tex]r=\frac{3}{100}+1=1.03[/tex]

We are to calculate the sum of the GP in the question. The formula for the sum of a GP is given as

[tex]S_n=\frac{a(r^n-1)}{r-1}[/tex]

Since we're calculating the total income up to 10 years, we have

[tex]n=10[/tex]

Therefore, we can calculate the sum to be

[tex]\begin{gathered} S_{10}=\frac{50000(1.03^{10}-1)}{1.03-1} \\ S_{10}=573193.97 \end{gathered}[/tex]

The correct option is OPTION D.