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Find the principal which gives ₹ 420 as C.I @ 20% p.a compounded half yearly for one year.

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Find the principal which gives ₹ 420 as C.I @ 20% p.a compounded half yearly for one year.

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CI = ₹420

Rate = ₹ 20% p.a

Principle = ₹ [required to find] Time period (n) = 1 year.

However, let us value of r to be 20% p.a so for half yearly, r is 20/2 = 10%

Formula for Amount (A) when compounded half yearly is

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