Question

Question 1. Find the unknown quantity in each of the following :
(i) Principal = ?
Rate of interest = 3.5%
Time = 2 years
Simple Interest = ?
Amount = ₹535

(ii) Principal = ₹450
Rate of interest = ?
Time = 7/2 years
Simple Interest = ₹189
Amount = ?

(iii) Principal = ₹ 850
Rate of interest = 6%
Time = ?
Simple interest = ₹ 178.50
Amount = ?

Answer 1

Answer:

Given

Principal Amount= P = ?

Rate of Interest Per annum= R= 3.5%

Time = T = 2 years

Amount = 535

We know that

Amount= P(1+TR)

535=P(1 + 2×3.5/100)

535=P(1 + 0.07)

535 =P(1.07)

535/1.008 = P

500= P is the Principal Amount

Simple Interest= Final amount - Principal Amount

= 535 - 500 = 35

Answer 2

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Answer: The simple interest is Rs. 6.75

Answer: The simple interest is Rs. 6.75

Step-by-step explanation:

Given principle; P = Rs. 450

Rate= \dfrac{9}{2} \%

Time= 4 months = \dfrac{4}{12}=\dfrac{1}{3}\text{ years }

years

Now as we know Simple interest S.I. is given by

S.I. =\dfrac{P\times R\times T}{100} =\dfrac{450\times \dfrac{9}{2} \times \dfrac{1}{3} }{100} =Rs. 6.75S.I.=

100

P×R×T

=Rs.6.75

Hence, the simple interest is Rs. 6.75