The U.S. Bureau of Labor Statistics provides additional price indexes across many different types of goods and services. Typical
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The number of years in which the money is in the account is 6 years.
<h3>What is simple interest?</h3>Simple interest denotes the amount of payment that is received or paid by a person in return for anything pledged or given a loan.
The interest computed on the principal amount for a specified duration of time and rate of interest is called simple interest.
The formula of simple interest:
Where, (P) stands for principal, (r) for interest rate, and (t) is for the time period.
<u>Computation </u><u>of a number of years:</u>
According to the given information,
P=$500,
r=7.5%,
t=?
SI= $225
Now, substitute the given values in the above formula, we have:
Therefore, the number of years is 6 years.
To learn more about the simple interest, refer to:
Answer:
Explanation:
So, we are looking for a linear equation. As we know Equation of a line has different forms, let´s use slope-intercept form:
Where C is the total cost as a function of t, t is the amount of airtime in minutes, m is the slope and b is the y-intercept
Now, let´s use the data provide in order to find m and b:
(E1)
(E2)
We have a 2X2 system of equations, let´s solve it using elimination method:
Replacing b in (E1) or (E2):
Knowing the slope m and the y-intercept b the linear model that represents the total cost as a function of t is:
You can check the results evaluating t=150 and t=300, the results must be 40 and 55 respectively