(a)
To prove : After t years the total amount of interest received from investment plus the original is given by f(x)=1000(1+0.05t) .
Given information :
A certificate of deposit of $1000 earns 5% each year. The interest will be mailed and there will be no interest on interest.
Formula used:
The amount in simple interest is,
A=P+PRT , where P= Principal, R= Rate of interest and T= no. of years.
Proof :
The interest on $1000 at 5% per annum after t years will be,
I=P×R×T=(1000×0.05×t)=(1000×0.05t)
The amount f(x) after t years will be,
f(x)=P+PRT=1000+(1000×0.05t)=1000(1+0.05t)
Therefore, it is proved that after t years the total amount of interest received from investment plus the original is given by f(x)=1000(1+0.05t) .
(b)
To calculate : The values of two investments for t=1,2,........,10 years .
The amount received in compound interest is more than the amount received in simple interest.
Given information :
A certificate of deposit of $1000 earns 5% each year. The interest will be mailed and there will be no interest on interest. Another $1000 at 5% compounded continuously.
Formula used:
The amount in simple interest is,
A=P+PRT , where P= Principal, R= Rate of interest and T= no. of years.
The amount in compound interest is,
A=Pert , where P= Principal, r= Rate of interest and t= no. of years.
Calculation :
After t years the total amount of interest received from first investment plus the original is given by f(x)=1000(1+0.05t) .
Years (t) | Amount by Simple interest f(x)=1000(1+0.05t) | Amount by compound interest A=1000ert |
12345678910 | 1050110011501200125013001350140014501500 | 1051.271105.171161.831221.401284.031349.861419.071491.821568.311648.72 |
Therefore, the amount received in compound interest is more than the amount received in simple interest.
Chapter 3 Solutions
PRECALCULUS:GRAPHICAL,...-NASTA ED.
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