When interest is compounded half-yearly then the formula for C.I. for the given time is :

1 year :

1. $P\Big(1 + \dfrac{r}{200}\Big)^2 - P$

2. $P\Big(1 + \dfrac{r}{100}\Big)^2 - P$

3. $P\Big(1 + \dfrac{r}{200}\Big)^2$

4. $P\Big(1 + \dfrac{r}{100}\Big)^2$

When interest is compounded half-yearly then the formula for C.I. for the given time is :

$1\dfrac{1}{2}$ years

1. $P\Big(1 + \dfrac{r}{200}\Big)^{\dfrac{3}{2}} - P$

2. $P\Big(1 + \dfrac{r}{200}\Big)^3 - P$

3. $P\Big(1 + \dfrac{r}{100}\Big)^3 - P$

4. $P\Big(1 + \dfrac{r}{100}\Big)^{\dfrac{3}{2}} - P$

If ₹ 6000 earns C.I. = ₹ 1200 in 6 months; then the rate of interest per year is :

1. 40%

2. 15%

3. 20%

4. 24%

On a certain sum, the S.I. for 2 years is ₹ 2400. If the rate of interest is 10% p.a., then :

C.I. for 1st year is :

1. ₹ 1200

2. ₹ 1320

3. ₹ 1800

4. ₹ 2640