## RS Aggarwal Class 7 Solutions Chapter 12 Simple Interest Ex 12A

These Solutions are part of RS Aggarwal Solutions Class 7. Here we have given RS Aggarwal Solutions Class 7 Chapter 12 Simple Interest Ex 12A.

**Other Exercises**

- RS Aggarwal Solutions Class 7 Chapter 12 Simple Interest Ex 12A
- RS Aggarwal Solutions Class 7 Chapter 12 Simple Interest Ex 12B
- RS Aggarwal Solutions Class 7 Chapter 12 Simple Interest CCE Test Paper

**Find the simple interest and the amount when :**

**Question 1.**

**Solution:**

Principal (P) = Rs. 6400

Rate (r) = 6% p.a.

Time (t) = 2 years

**Question 2.**

**Solution:**

Principal (P) = Rs. 2650

Rate (r) = 8% p.a.

**Question 3.**

**Solution:**

Principal (P) = Rs. 1500

Rate (r) = 12% p.a.

**Question 4.**

**Solution:**

Principal (P) = Rs. 9600

**Question 5.**

**Solution:**

Principal (P) = Rs. 5000

Rate (r) = 9% p.a.

**Find the time when :**

**Question 6.**

**Solution:**

Principal (P) = Rs. 6400

S.I. = Rs. 1152

Rate (r) = 6% p.a.

**Question 7.**

**Solution:**

Principal (P) = Rs. 9540

S.I. = Rs. 1908

Rate (r) = 8% p.a.

**Question 8.**

**Solution:**

Amount (A) = Rs. 6450

Principal (P) = Rs. 5000

S.I. = A – P = Rs. (6450 – 5000) = Rs. 1450

Rate (r) = 12% p.a.

**Find the rate when :**

**Question 9.**

**Solution:**

Principal (P) = Rs. 8250

S.I. = Rs. 1100

Time (t) = 2 years

**Question 10.**

**Solution:**

Principal (P) = Rs. 5200

S.I. = Rs. 975

**Question 11.**

**Solution:**

Principal (P) = Rs. 3560

Amount (A) = Rs. 4521.20

S.I. = A – P = Rs. 4521.20 – 3560 = Rs. 961.20

Time (t) = 3 years

**Question 12.**

**Solution:**

Principal (P) = Rs. 6000

Rate (r) = 12% p.a.

**Question 13.**

**Solution:**

Principal = Rs. 12600

Rate (A) = 15% p.a.

Time (t) = 3 years

Amount = P + S.I. = Rs. 12600 + Rs. 5670 = Rs. 18270

Amount paid in cash = Rs. 7070

Balance = Rs. 18270 – 7070 = Rs. 11200

Price of goat = Rs. 11200

**Question 14.**

**Solution:**

S.I. = Rs. 829.50

Rate (r) = 10% p.a.

Time (t) = 3 years

**Question 15.**

**Solution:**

Amount (A) = Rs. 3920

**Question 16.**

**Solution:**

Amount = Rs. 4491

Let principal (P) = Rs. 100

Rate (r) =11% p.a.

Time (t) = 2 years 3 months = 2\(\frac { 1 }{ 4 }\) = \(\frac { 9 }{ 4 }\) years

**Question 17.**

**Solution:**

Amount = Rs. 12122

Let principal (P) = Rs. 100

Rate (r) = 8% p.a.

Time (t) = 2 years

**Question 18.**

**Solution:**

Amount (A) = Rs. 4734

Principal (P) = Rs. 3600

S.I. = A – P = Rs. 4734 – Rs. 3600 = Rs. 1134

**Question 19.**

**Solution:**

In first case,

Amount (A) = Rs. 768

Principal (P) = Rs. 640

S.I. = A – P = Rs. 768 – 640 = Rs. 128

**Question 20.**

**Solution:**

Principal (P) = Rs. 5600

Amount (A) = Rs. 6720

S.I. = A – P = Rs. 6720 – 5600 = Rs. 1120

Rate (r) = 8% p.a.

**Question 21.**

**Solution:**

Let principal (P) = Rs. 100

then amount (A) = Rs. 100 x \(\frac { 8 }{ 5 }\) = Rs. 160

S.I. = A – P = Rs. 160 – 100 = Rs. 60

Time (t) = 5 years

**Question 22.**

**Solution:**

Amount in 3 years = Rs. 837

Amount in 2 years = Rs. 783

Difference = Rs. 837 – Rs. 783 = Rs. 54

Rs. 54 is interest for 1 year

Interest for 2 years = 2 x 54 = Rs. 108

Principal = Rs. 783 – 108 = Rs. 675

**Question 23.**

**Solution:**

Amount in 5 years = Rs. 5475

Amount in 3 years = Rs. 4745

Interest for 2 years = Rs. 5475 – 4745 = Rs. 730

**Question 24.**

**Solution:**

Total sum = Rs. 3000

Let first part = Rs. x

Then second part = Rs. (3000 – x)

Now, interest on first part at the rate of

**Question 25.**

**Solution:**

Total sum =Rs. 3600

Let first part = Rs. x

Then second part = Rs. (3600 – x)

Interest on first part for 1 year at 9% p.a.

⇒ 9x + 10 (3600 – x) = 33300

⇒ 9x + 36000 – 10x = 33300

⇒ -x = 33300 – 36000

⇒ -x = – 2700

⇒ x = 2700

First part = Rs. 2700

and second part = Rs. 3600 – 2700 = Rs. 900

Hope given RS Aggarwal Solutions Class 7 Chapter 12 Simple Interest Ex 12A are helpful to complete your math homework.

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