Question

formula for calculating principal in simple interest.... for class 7​

Answer 1

Answer:

p*r*t/100

Step-by-step explanation:

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Answer 2

Answer:

Rate of interest = r%Time=212 years=52 yearsAmount=65× Sum Rate=? Amount =65×SumPrincipal + S. I. = AmountPrincipal+Principal×Rate×Time100=65×Principal=>x+xr×5100×2=65x=>x(1+5r100×2)=65x=>1+r40=65=>r=40×15=>r=8So, the rate of interest is 8%.