Question

at what rate of simple interest per annum will 10,000 rupay amount 12,100 in 3 year

Answer 1

Interest = Amount - Principal
                12100 - 10000 = 2100
Interest = PTR/100 ⇒ (10000)(3)(R)/100 = 2100
                                    3R = 21 ⇒ R = 7% p.a.


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Answer 2

Given Amount = 12100, Principal = 10000, T = 3 years.

We know that SI = A - P

                            = 12100 - 10000

                            = 2100.


We know that SI = (P * T * R)/100

                       2100 = (10000 * 3 * R)/100

                       2100 = 300R

                        R = 7.


Therefore the rate of SI per annum= 7%.


Hope this helps!