Question

41. In how many years does the sum of 1200 | 45.
become 1800 at the rate of simple interest
of 5% per annum?
(A) 10
(B) 20
(C) 15
(D) 25​

Answer 1

It will take 10 year to become 1800

Step-by-step explanation:

We have given principal amount P = 1200

At the rate of 5% amount become 1800

So A = 1800

So simple interest = 1800 - 1200 = 600

Simple interest is given by $SI=\frac{P\times r\times t}{100}$

$600=\frac{1200\times 5\times t}{100}$

t = 10 years

So 1200 will take 10 years to become 1800

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Answer 2

Answer:

principle=Rs1200

Total amount=Rs 1800

Rate of interest=5%per annum

Number of years=?

Step 1=

FIND THE SIMPLE INTEREST

total amount=principle+simple interest

800=1200+simple interest

simple interest= 1800-1200

simple interest=600

Step 2

FIND THE NUMBER OF YEARS

• simple interest =p× n× r/
• 600= 1200×n×5/
• 60n=600
• n=10
• Thus it takes 10year for sum of Rs1200 become Rs 1800 at the rate of simple interest of 5%per annum

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