Question

when rate is 10% ,time is 5 years and amount is 30000 then find principal and simple interest

Answer 1

Answer:

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Step-by-step explanation:

Since

Amount A = Principal P + Simple interest SI

i.e     A = P + SI                  ------------ eqn 1

then SI = A - P

        SI = 30000 - P          ------------- eqn 2

And since SI = (PRT) / 100 ------------ eqn 3

then input eqn 2 into eqn 3

 30000 - P = (p×10×5) / 100

 100 (30000 - P) = 50P

  3000000 - 100P = 50P

  150P = 3000000

  P = 3000000/150

∴ P = 20000

(ii) From eqn 2

     SI = 30000 - P

     SI = 30000- 20000

  ∴ SI = 10000

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