Calculate time when $R s .400$ will produce same interest at $10$ % at $R s .900$ produces in 4 years at $3.5$ %

3.25

years

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3.15

years

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4.2

years

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None

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Solution

The correct option is B $3.15$ years
$S I = \frac{900 \times 3.5 \times 4}{100}$ , $T = \frac{100 \times 900 \times 3.5 \times 4}{100 \times 400 \times 10}$
$= \frac{9 \times 35 \times 4}{4 \times 100} = \frac{9 \times 35}{100}$
$= \frac{315}{100} = 3.15$

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Calculate time when Rs.400 will produce same interest at 10% at Rs.900 produces in 4 years at 3.5%

The correct option is B 3.15 yearsSI=900×3.5×4100, T=100×900×3.5×4100×400×10=9×35×44×100=9×35100=315100=3.15

Calculate time when $R s .400$ will produce same interest at $10$ % at $R s .900$ produces in 4 years at $3.5$ %

The correct option is B $3.15$ years
$S I = \frac{900 \times 3.5 \times 4}{100}$ , $T = \frac{100 \times 900 \times 3.5 \times 4}{100 \times 400 \times 10}$
$= \frac{9 \times 35 \times 4}{4 \times 100} = \frac{9 \times 35}{100}$
$= \frac{315}{100} = 3.15$