Question

a sum of money amounts to Rs2900 in 8 years and to Rs 3000 in 10 years at a certain rate of interest find this rate of interest per annum​

Answer 1

Answer:

2%

Step-by-step explanation:

Principal + interest for 8 years = 2900 Rs…………(I)

Principal + interest for 10 years = 3000 Rs……..…(II)

Subtracting equation (I) from (II)

Interest for 2 years = 100 Rs.

∴ Interest for 8 years = 400 Rs.

From equation (I),

Principal = (2900 – 400) = 2500 Rs.

\therefore Rate = \frac{SI\times 100}{Princ.\times Time}

= \frac{400\times 100}{8\times 2500} = 2\%

Answer 2

Answer:

2%

Step-by-step explanation:

p+I for 8years=2900Rs........…(1)

p+I for 10years=3000.Rs.........(2)

subtract (1) from (2)

interest for 2years=100Rs.

therefore, 8years=400Rs.

from (1) p=(2900-400)=2500Rs.

RATE=si×100/p×t

=400×100/8×2500

=2%

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