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What sum will yield Rs.540 as Simple Interest at 4% for 7.5 years?
SI = $$ \frac{PNR}{100} $$
$$ 540 = \frac{P \times 7.5 \times 4}{100} $$
$$ P = \frac{540 \times 100}{4 \times 7.5} $$
solving P =1800
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