Question

₹9000 become ₹1800 at simple interest in 8 years. Find the rate percent annum.
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Answer 1

Answer:

2.5 p.a.

Step-by-step explanation:

Principal = Rs. 9000

Rate = ?

Simple Interest = Rs. 1800

Time = 8 years

S.I. = PRT/100

R = (100 × S.I.)÷PT = (100 × 1800) ÷ (9000 × 8) = 2.5 % p.a.

Answer 2

Given :

Principal = ₹ 900

Time = ₹ 8 yrs

Amount = ₹ 1800

Rate = ?

To Find :

Rate of Simple Interest

Formula Used :

Amount = Principal + Simple Interest

AND

$si = \frac{p \times r \times t}{100}$

Procedure :

Amount = P + SI

1800 = 900 + SI

SI = 1800 - 900

SI = ₹ 900

$si = \frac{prt}{100} \\ \\ 900= \frac{900 \times r \times 8}{100} \\ \\ 900 = 9 \times r \times 8 \\ 900 = 72r \\ r = \frac{900}{72} \\ \\ r = 12.5\%$

Solution :

Rate = 12.5 %

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