4r = 100
⇒ r = 25%
Rate of interest r = 25%
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Question
If a principal is getting doubled after 4 years, then calculate the rate of interest. (Hint: Let P = ₹ 100)
Sum
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Solution
Let the principal P = ₹ 100
Given it is doubled after 4 years
i.e. Time n = 4 years
After 4 years A = ₹ 200
∴ A = P + I
A – P = I
200 – 100 = I
After 4 years interest I = 100
I = `"Pnr"/100`
⇒ 100 = `(100 xx 4 xx "r")/100`
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