Question

In what time will principal of rupees 3200 at rate of 8% become Rs3840​

Answer 1

Answer:

principal =3200and rate =8%

Amount =3840 so simple interest =3840-3200 =640

time is 640×100÷8×3200=2.5

Answer 2

Answer:

$2 \frac{1}{2} \: years$

Solution:-

Principal=Rs.3200

Amount=Rs.3840

Rate=8℅

Time=?

We know that

Simple Interest=Amount-Principal

=3840-3200

=640

we also know that

$time = \frac{s.i \times 100}{p \times r}$

$= \frac{640 \times 100}{3200 \times 8}$

$= \frac{5}{2}$

$= 2 \frac{1}{2}$

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At 2 and half year principal of rupees 3200 at rate of 8℅ become Rs.3840