Question

a sum of rs 400 amounts to rs480 in 4 years. what will it amount to , if the rate of interest is increased to 2 peeent per annum

Answer 1

Amount=480.
Principal= 400.
Time = 4 years.
S.I. = Amount- principal.
= 480-400.
= 80.
So Rate=(simple interest×100)/Principal× time
Rate = 80×100/400×4.
=5 %.
If rate is 2% annum increased.
New rate = 5+2=7%.
S.I. = (P×R×T)/100.
= (400×7×4)/100.
=11200/100.
= 112.
Therefore new amount= principal+simple interest.
= 400 +112. = 512.
Hope it helps.

Answer 2

Answer:

New Amount = 400 +112. = 512

Step-by-step explanation:

Amount=480.

Principal= 400.

Time = 4 years.

S.I. = 480-400.

= 80.

Rate = 80×100/400×4.

=5 %.

If rate is 2% annum increased.

New rate = 5+2=7%.

S.I.= (400×7×4)/100.

=11200/100.

= 112.

Therefore new amount = 400 +112. = 512.