Respuesta :
The Rate of Interest (R) is 5.05%
What is simple interest?
"The method of calculating the interest amount for a particular principal amount of money at some rate of interest."
Formula to calculate the simple interest:
SI = (P × R × T)/100
where
P = Principal,
R = Rate of Interest,
T = Time period.
Formula for an amount:
A = P + I,
where P is the Principal and I is the amount of interest
Formula to calculate rate of interest:
R = (I × 100)/ PT
For given problem,
A = $13000
I = $625
T = 1
We find the principal using the formula of amount.
⇒ A = P + I
⇒ 13000 = P + 625
⇒ P = 13000 - 625
⇒ P = $12375
Using the formula to calculate the rate of interest,
⇒ R = (I × 100)/ PT
⇒ R = (625 × 100)/ (12375 × 1)
⇒ R = 5.05%
Therefore, the Rate of Interest (R) is 5.05%
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