Given Interest or Amount Find P or n
- Slides: 9
Given Interest or Amount Find P or n or r
Recap on simple interest Amount = Principal + Interest Where n is in years
Example 1: Naveen invested Rs. 3500 in a bank with the rate interest of 9% per annum. After some years he received RS. 1575 as an interest. Find the number of years. Solution Given: - Principal(p)=3500, Interest = 1575, rate=9% To Find: - number of years 5 45 315 7 n=5 Ans: - number of years = 5
Example 2: A certain sum of money amounts to Rs 210 as interest in 2 years at 7 %. Find the principal. Solution Given: I= 210 , r=7% , n=2 years. To Find: Principal(p) Ans: Principal (P) = 1500
Example 3: - Find the rate percent per annum when a principal of Rs. 5, 000 earns a S. I. of Rs. 1, 250 in 1 year. Solution : Given: p= 5, 000 Ans : r = 25% n= 1 year I=1250 To Find : Rate (r)
Example 4: Ram invested Rs. 5, 000 at the rate of 5 % simple interest per annum. He received the amount with simple interest of 500 after some years. Find the number of years. Solution Given P=5000 r=5% , I=500 To Find: Number of year(n) Ans: - N= 2 years
Example 5: Sathya deposited Rs. 6, 000 in a bank and received Rs. 7500 at the end of 5 years. Find the rate of interest Solution Given: - Principal(p)=6000, Amount(A)=7500, no of years(n)=5 To Find: - rate(r) Amount = Principal + Interest = Amount – Principal = 7500 - 6000 = 1500 20 4 r=5 Ans: - rate of interest = 5% 5
Example 6: - Sita invested Rs. 5, 000 at the rate of 5 % simple interest per annum. She received Rs. 5, 500 after some years. Find the number of years. Solution Given : A= Rs. 5, 500 , p=Rs. 5000 , r= 5% To Find: Number of year(n) I = A-P I = 5, 500 - 5, 000 I = 500 Ans: - N= 2 years
Try these 1. Bhavana invested Rs. 25, 000 for 6 years and received an amount of Rs. 2500. Find the rate of Interest 2. An amounts Rs. 15, 000 invested at 4 % per annum earns an Interest of Rs. 3000. Find the number of years
