## Selina Publishers Concise Mathematics Class 7 ICSE Solutions Chapter 10 Simple Interest

**Selina Publishers Concise Mathematics Class 7 ICSE Solutions Chapter 10 Simple Interest**

### Simple Interest Exercise 10 – Selina Concise Mathematics Class 7 ICSE Solutions

**Question 1.****Find the S.I. and amount on :**** (i) Rs. 150 for 4 years at 5% per year.**** (ii) Rs. 350 for 3\\(\\frac {1 }{ 2 }) years at 8% p.a.**** (iii) Rs. 620 for 4 months at 8 p. per rupee per month.**** (iv) Rs. 3,380 for 30 months at 4 \\(\\frac { 1 }{ 2 }) % p.a.**** (v) 600 from July 12 to Dec. 5 at 10% p.a.**** (vi) Rs. 850 from 10th March to 3rd August at 2 \\(\\frac { 1 }{ 2 }) % p.a.**** (vii) Rs. 225 for 3 years 9 months at 16% p.a.**

**Solution:**

**Question 2.****On what sum of money does the S.I. for 10 years at 5% become Rs. 1,600 ?**

**Solution:**

**Question 3.****Find the time in which Rs. 2,000 will amount to Rs. 2,330 at 11% p.a. ?**

**Solution:**

**Question 4.****In what time will a sum of money double it self at 8% p.a ?**

**Solution:**

**Question 5.****In how many years will be ₹870 amount to ₹1,044, the rate of interest being 2\\(\\frac { 1 }{ 2 }) % p.a ?**

**Solution:**

**Question 6.****Find the rate percent if the S.I. on ₹275 is 2 years is ₹22.**

**Solution:**

**Question 7.****Find the sum which will amount to ₹700 in 5 years at 8% rate p.a.**

**Solution:**

**Question 8.****What is the rate of interest, if ₹3,750 amounts to ₹4,650 in 4 years ?**

**Solution:**

**Question 9.****In 4 years, ₹6,000 amount to ₹8,000. In what time will ₹525 amount to ₹700 at the same rate ?**

**Solution:**

**Question 10.****The interest on a sum of money at the end of 2\\(\\frac { 1 }{ 2 }) years is \\(\\frac { 4 }{ 5 }) of the sum. What is the rate percent ?**

**Solution:**

**Question 11.****What sum of money lent out at 5% for 3 years will produce the same interest as Rs. 900 lent out at 4% for 5 years ?**

**Solution:**

**Question 12.****A sum of Rs. 1,780 become Rs. 2,136 in 4 years,**** Find :**** (i) the rate of interest.**** (ii) the sum that will become Rs. 810 in 7 years at the same rate of interest ?**

**Solution:**

**Question 13.****A sum amounts to Rs. 2,652 in 6 years at 5% p.a. simple interest.**** Find :**** (i) the sum**** (ii) the time in which the same sum will double itself at the same rate of interest.**

**Solution:**

**Question 14.****P and Q invest Rs. 36,000 and Rs. 25,000 respectively at the same rate of interest per year. If at the end of 4 years, P gets Rs. 3,080 more interest than Q; find the rate of interest.**

**Solution:**

**Question 15.****A sum of money is lent for 5 years at R% simple interest per annum. If the interest earned be one-fourth of the money lent, find the value of R.**

**Solution:**

**Question 16.****The simple interest earned on a certain sum in 5 years is 30% of the sum. Find the rate of interest.**

**Solution:**