NCERT Class 8 Mathematics Solutions: Chapter 8 – Comparing Quantities Exercise 8.3 Part 5

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Example of how to find amount

Example of How to Find Amount

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Question 9: Find the amount which Ram will get on Rs. 4,096, if he gave it for 18 months at per annum, interest being compounded half yearly.

Answer:

Here, Principal (P) = Rs. 4096.

Rate of Interest (R) = (compounded half yearly)

Time (n) = 18 months = years = 3 half-years (compounded half yearly)

Amount (A)

Question 10: The population of a place increased to 54,000 in 2003 at a rate of 5% per annum.

(i) Find the population in 2001.

(ii) What would be its population in 2005?

Answer:

(i) Find the population in 2001.

Here,

Population would be less in 2001 than 2003 in two years.

Here, population is increasing.

(ii) According to question, population is increasing. Therefore population in 2005,