Question

what principal amount to ₹ 480 in 3 year at the rate of 8 % simple interest per annum ?.​

Answer 1

Answer:

Principal = Rs.400, Amount = Rs.480

Simple Interest = Rs.(480−400)

=Rs.80

Time = 4 years

Rate in percentage =SI×100P×T

Rate in percentage =80×100400×4=80001600=5%

New rate of interest

=(5+2)=7%

Interest=400×7×4100=112

Hence amount=Rs.(400+112)

=Rs.512

Answer 2

Question:

what principle amount to ₹ 480 in 3 year at the rate of 8 % simple interest per annum ?

What to find:

Principle

Information given in the question:

• Amount=480rs
• Rate of interest per annum=8%
• Time=3years

Solution:

Let,The principle be $x$ rs

$\to480-x=\frac{x * 3 * 8}{100}$

$\to or,100(480 - x)=24x$

$\to or,48000-100x=24x$

$\to or,48000=100x+24x$

$\to or,124x=48000$

$\to or, x=\frac{48000}{124}$

$\to or,x=387.09(approx)$

Used formula:

$\to$Simple interest=$\frac{Principle * Time * Rate of interest per annum }{100}$

Answer:

The principle=387.09rs