Question

find the principal when final amount is rs 2420 at 4% per annum for 5/2 years .​

Answer 1

P=I/RT

=2420×10/4×25

=242

Answer 2

$\huge\sf\pink{Answer}$

☞ Principal = 2200

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$\huge\sf\blue{Given}$

➝ Final Amount = 2420

➝ Interest = 4% per annum

➝ Time = 5/2 years

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$\huge\sf\gray{To \:Find}$

✭ The principal?

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$\huge\sf\purple{Steps}$

$\sf\dashrightarrow S.I = A - p \\ \\ \sf\dashrightarrow S.I= 2420 - p \qquad -eq (1) \\ \\ \sf \dashrightarrow S.I= \frac{p \times r \times t}{100} \\ \\ \sf \dashrightarrow 2420 - p = \frac{p \times 4 \times \frac{5}{2} }{100} \\ \\ \sf\dashrightarrow 2420 - p = \frac{20p}{200} \\ \\ \sf\dashrightarrow 2420 - p = 0.1p \\ \\ \sf \dashrightarrow 2420 = 0.1p + p \\ \\ \sf\dashrightarrow 1.1p = 2420 \\ \\ \sf\dashrightarrow p = \frac{2420}{1.1} \\ \\ \orange{\sf \dashrightarrow p = 2200 \: rupees}$

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