Ssc ibps rrb Simple and Compound Interest fromulas , tips and tricks

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Simple & Compound Interest Formulas and Tricks



Simple Interest Formulas - SI = p*t*r/100 

 The annual payment that will discharge a debt of INR A due in t years at the rate of interest r% per annum is = (100 * A) / [(100 * t) + r*t* (t-1)]/2


 P = (Interest * 100) / [(t1*r1) + (t2*r2) + (t3*r3) + …..]


 Rate = [100 * (Multiple number of principal – 1)] / Time


 Sum = (More Interest * 100) / (Time * More Rate)



Compound Interest Formulas -


 When Interest is compounded annually –

Amount = P [1 + (r/100)]t


 When Interest is compounded half-yearly –

Amount = P [1 + (r/200)]2t


 When Interest is compounded quarterly –

Amount = P [1 + (r/400)]4t


 When rate of Interest is r1%, r2% and r3% then –

Amount = P [1 + (r1/100)] * [1 + (r2/100)] * [1 + (r3/100)]


 Simple Interest for 2 years = 2*r = 2r% of capital


 Compound Interest for 2 years = [2r +(r2/100)]% of capital


 Simple Interest for 3 years = 3*r = 3r% of capital


 Compound Interest for 3 years = [3r +(3r2/100) + (r3/1002)]% of capital

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