सरल और मिश्रित ब्याज - Simple And Compound Interest
If
P = Principal,
R = Rate per annum,
T = Time in years,
SI = Simple interest,
A = Amount
70.
71. If P = Principal, A = Amount
in n years, R = rate of interest per annum.
interest payable annually
72. (i) 
interest payable half-yearly
R' = R/2,n' = 2n
(ii) 
interest payable quarterly;
73.(i) 
s the yearly growth factor;
(ii) 
is the yearly decay factor or depreciation factor
74. When time is fraction of a year, say
years, then
Amount= 
75CI = Amount - Principal = . 
76. When Rates are different for different years, say R1, R2, R3% for 1st, 2nd & 3rd years respectively, then,
77.Amount = 
In general, interest is considered to be SIMPLE unless otherwise stated.
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