Question

at what percent whould rupees 3200 amount to 3700 in 2 years

Answer 1

$principle \: = \: amount - si \\ si = 3700 - 3200 \\ \: \: \: \: \: \: = 500 \\ si = \frac{prt}{100} = \frac{3200 \times 2 \times r}{100} = 64r \\ r = \frac{500}{64} = 7.815\%$
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Answer 2

SI=A-P

=Rs(3700-3200)

=Rs 500

SI=PRT/100

R=(100*SI)/PT

=(100*500)/(3200*2)

=(50000/6400)

=7.2185%