Question

How much is the Simple Interest earned on ₹450 for 9 months at 12 p.c.p.a?

Answer 1

Solution:

Principal = ₹450

Time = 9months = ¾ years.

Rate = 12%

$\sf{SI= \dfrac{P \times R \times T}{100} }$

$\sf{ = \dfrac{450 \times 12 \times \dfrac{3}{4}}{100} }$

$\sf{ = \dfrac{450 \times 12 \times 3}{100 \times 4} }$

$\sf{ = \dfrac{81}{2}}$

$\sf{=₹40.5}$

Simple Interest = ₹ 40.5.

Hence, solved!! ✓

Additional Information

Some Important formulas of Simple Interest

A = P + SI

P = A - SI

SI = A - P

A = P(1 + R×T/100).

Answer 2

To Find :

The simple interest on the principle given

__________________________

Given :

• Principle = ₹450
• Rate = 12% pa
• Time = 9 month

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Formula to be applied :

• SI = PTR/100

__________________________

Solution :

Given, Principle = 450

Time = 9 month

or, time = 9/12 year

or, time = 0.75 year

So, SI = (450×0.75×12)/100

or, SI = 450×9/100

or, SI = 4.5×9

or, SI = ₹41.5

so, The Simple Interest = ₹450

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Other Information:

• SI = PTR/100
• P = 100SI/TR

Amount = P+(PTR/100)

• Amount = P(1+ TR/100)

Some Formula on Compound Interest:

$\bull \: \tt{amount \: on \: ci = {p(1 + \frac{r}{100} )}^{t} }$