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To find Principal when Time Interest and Rate are given
To find Principal when Time Interest and Rate are given the rules are.
Interest = (Principal × Rate × Time)/100
Principal = (100 × Interest)/(Rate × Time)
For example:
1. Find Principal when Time = 3 years, Interest = $ 600; Rate = 4% p.a.
Solution:
Time = 3 years,
Interest = $ 600,
Rate = 4% p.a.
Principal = (100 × Interest)/(Rate × Time)
= (100 × 600)/(4 × 3)
= 60000/12
= 5000
Therefore, Principal (P) = $ 5000.
2. Find Principal when Time = 5 years, Interest = $ 500; Rate = 5% p.a.
Solution:
Time = 5 years,
Interest = $ 500,
Rate = 5% p.a.
Principal = (100 × Interest)/(Rate × Time)
= (100 × 500)/(5 × 5)
= 50000/25
= 2000
Therefore, Principal (P) = $ 2000.
3. Find Principal when Time = 4 years, Interest = $ 400; Rate = 5% p.a.
Solution:
Time = 4 years,
Interest = $ 400,
Rate = 5% p.a.
Principal = (100 × Interest)/(Rate × Time)
= (100 × 400)/(5 × 4)
= 40000/20
= 2000
Therefore, Principal (P) = $ 2000.
Word Problems on Simple Interest.
In Simple Interest when the Time is given in Months and Days.
To find Principal when Time Interest and Rate are given.
To find Rate when Principal Interest and Time are given .
To find Time when Principal Interest and Rate are given.
Worksheet on Factors affecting Interest
5th Grade Numbers Page
5th Grade Math Problems
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