What is the compound interest on 7500 at 4% per annum for 2 years compounded annually?

You wrote

C.I. = 7,500(.02) = 150

C.I. = 7650 (.02) = 153

In particular you used (.02) there. The problem stated however "4% per annum", so you should have used (.04) instead.

7500(.04) = 300

7800(.04) = 312

300+312 = 612

Your answer and method would have been correct if the problem read "Find compound interest on 7500 dollars at 2% per annum for 2 years, compounded annually." or if it read as "Find compound interest on 7500 dollars at 4% per annum for 1 year, compounded semi-annually."


Edit: In response to your question on how to interpret the answer key's solution.

[7500(1 + 4/100)2], although poorly typed is meant to be $7500\cdot(1+\frac{4}{100})^2$

Interest rate formula: $$F = P(1+\frac{r}{n})^{ny}$$ where $F$ = future value, $P$ = initial value (principle), $r$ = APR (interest rate per year), $n$ = number of times per year it is compounded, $y$ = number of years.

In this case, $P=7500$, $r=.04$, $n=1$, and $y=2$, and $F$ is unknown. So, by the formula above, $F=7500(1+.04)^2$. With a bit of arithmetical simplifications, $=7500(1.04)^2 = 7500(\frac{26}{25}\cdot\frac{26}{25})$

Often times you will see the formula rewritten as $F = P(1+i)^t$ where $i$= interest rate per payment period = $\frac{r}{n}$, and $t$ = number of payment periods = $n\cdot y$.

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Important Civilization in Rajasthan

15 Questions 15 Marks 10 Mins

Given:

Principal (P) = Rs. 7500

Rate % (R)= 4% per annum

Time Period (T) = 2 years

Formula Used:

\({\rm{Amount}} = {\rm{P}}{\left[ {1 + \;\frac{R}{{100}}} \right]^T}\;\)

Calculation:

\({\rm{Amount}} = 7500{\left[ {1 + \;\frac{4}{{100}}} \right]^2}\;\)

⇒ Amount = 7500 × [104/100]2

⇒ (7500 × 26 × 26)/(25 × 25)

⇒ 12 × 676 = Rs. 8112

∴ The Amount After 2 years will be Rs. 8112

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Solution

The correct option is CRs.612Using the formula A = P(1+r100)n and substituting P = ₹ 7500 , t = 2 years , r = 4 p.a , we haveA = ₹7500× (1+ 4100)2 =₹7500× 2625× 2625= ₹8112.C.I = A - P ∴ C.I.= ₹8112−7500 =₹612.

Solve

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Question Papers

What will be the compound interest on Rs 7500 at 4% per annum for 2 years compounded annually a RS 612 B RS 712 C RS 812 D RS 912?

Compound Interest = Rs. (8112−7500)= Rs. 612.

What is the formula of compound interest for 2 years?

For 2 years, T = 24. If interest is compounded half yearly, rate of interest = R / 2 and A = P [ 1 + ( {R / 2} / 100 ) ]T, where 'T' is the time period. For example, if we have to calculate the interest for 1 year, then T = 2. For 2 years, T = 4.

What is the compound interest on 3000 at 6% for 2 years?

Detailed Solution ∴ The compound interest for 2 years is Rs. 1320.

What is CI on Rs 7500 for 4 years if the rate of interest is 10% pa for the first 2 year and 20% pa for the next 2 year?

CI=5568 INR.