NCERT Class 8 Mathematics Solutions: Chapter 8 – Comparing Quantities Exercise 8.3 Part 6

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Find the interest after 2.5 years

Find the Interest After 2.5 Years

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Question: 11 In a laboratory, the count of bacteria in a certain experiment was increasing at the rate of 2.5% per hour. Find the bacteria at the end of 2 hours if the count was initially 5, 06,000.


Here, Principal (P) = 5, 06,000 Rate of Interest (R) = 2.5%, Time (n) = 2 hours

After 2 hours, number of bacteria

Amount (A)

Hence, number of bacteria after two hours are 531616.25

Question: 12 A scooters were bought at ₹ 42,000. Its value depreciated at the rate of 8% per annum. Find its value after one year.


Here, Principal (P) = Rs. 42,000, Rate of Interest (R) = 8%, Time (n) = 1 years

Amount (A)

Hence, the value of scooter after one year is Rs. 45,360