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Year 9 Maths Number and Financial Mathematics

Income and Taxation

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Question 1
42352

$3000 is invested for 18 months compounded at the interest rate of 0.75% every month. Give answer correct to the nearest cent, wherever necessary.

a. Calculate the final value of this investment
b. What is the increase in value obtained in part (a) as against investing the same amount for same time at same rate but at simple interest.

a) \(\$3431.88\)  b) \(\$26.88\)

(a)
$$\begin{aligned}
\text{Pricipal Amount} & =\$3000\\
\text{Compunding Rate of Interest} &= 0.75\%~\text{p.m.}\\
\text{Time Period}&=18~\text{month}\\
\text{Total Amount,}~A &=\$3000 \times 1.0075^{18}\\
&\approx \$3431.88 \end{aligned}$$ (b) $$\begin{aligned}
\text{If same amount is invested for same time} & \text{but at a simple rate..}\\
\text{Amount} A^{\prime} & =\$3000(1+0.0075\times 18)\\
&=\$3405\\
\text{Increase in value obtained}&=\$3431.88-\$3405\\
&=\$26.88
\end{aligned}$$

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