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Mathematics
Mariah
27 February, 21:24
I need to know how to do simple interest
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Marks
27 February, 21:58
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Use this simple interest calculator to find A, the Final Investment Value, using the simple interest formula: A = P (1 + rt) where P is the Principal amount of money to be invested at an Interest Rate R% per period for t Number of Time Periods. Where r is in decimal form; r=R/100; r and t are in the same units of time.
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Micaela Massey
27 February, 22:03
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Step-by-step explanation: Simple Interest Equation (Principal + Interest)
A = P (1 + rt)
Where:
A = Total Accrued Amount (principal + interest)
P = Principal Amount
I = Interest Amount
r = Rate of Interest per year in decimal; r = R/100
R = Rate of Interest per year as a percent; R = r * 100
t = Time Period involved in months or years
From the base formula, A = P (1 + rt) derived from A = P + I and I = Prt so A = P + I = P + Prt = P (1 + rt)
Note that rate r and time t should be in the same time units such as months or years. Time conversions that are based on day count of 365 days/year have 30.4167 days/month and 91.2501 days/quarter. 360 days/year have 30 days/month and 90 days/quarter.
Simple Interest Formulas and Calculations:
Use this simple interest calculator to find A, the Final Investment Value, using the simple interest formula: A = P (1 + rt) where P is the Principal amount of money to be invested at an Interest Rate R% per period for t Number of Time Periods. Where r is in decimal form; r=R/100; r and t are in the same units of time.
The accrued amount of an investment is the original principal P plus the accumulated simple interest, I = Prt, therefore we have:
A = P + I = P + (Prt), and finally A = P (1 + rt)
Calculate Total Amount Accrued (Principal + Interest), solve for A
A = P (1 + rt)
Calculate Principal Amount, solve for P
P = A / (1 + rt)
Calculate rate of interest in decimal, solve for r
r = (1/t) (A/P - 1)
Calculate rate of interest in percent
R = r * 100
Calculate time, solve for t
t = (1/r) (A/P - 1)
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