Question

what sum of money will amount to rs2420 in 5/2 years at 4% per annum simple interest​

Answer 1

Answer:

=2420×5/2×4/100

=24.2

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Answer 2

Let the required principal(sum) be n.

Then,

${ \boxed{ \sf( \frac{n \times 4 \times { \tiny{ \frac{5}{2} }}}{100}) = 2420 - n }} \\ \\ { \boxed{ \sf \frac{n \times 4 \times 5}{100 \times 2} = 2420 - n}} \\ \\ { \boxed{ \sf \: \: \: \: \: \: \: \frac{n \times 2}{20} = 2420 - n}} \\ \\ { \boxed{\sf \: \: \: \: \: \: \: \: \: \: \: \: \frac{n}{10} = 2420 - n }}\\ \\ { \boxed{ \sf \: \: \: \: \: \frac{n}{10} + n = 2420 \: \: \: \: \: }}\\ \\ { \boxed{ \sf \: \: \: \: \: \: \: \: \: \: \frac{11n}{10} = 2420 \: \: \: \: }} \\ \\ { \boxed{ \sf \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: n = \frac{2420 \times 10}{11} = 220 \times 10 }}\\ { \boxed{ \red{ \sf \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: n = 2200 \: \: }}}$

Hence, ₹2200 will amount to ₹2420 at 4% p.a in 5/2 years.