a sum of money at simple interest doubles in 10 years in how many years the same rate it will be tripled
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Answered by
11
Let P=100, A=200,It means I=100
Now We want A=300,means I=200
Years for I of Rs. 100 =10
Years for I of Rs. 200=(10/100)*200
=20 Years
Now We want A=300,means I=200
Years for I of Rs. 100 =10
Years for I of Rs. 200=(10/100)*200
=20 Years
Jhas69023:
is it correct bro
Answered by
2
Define x:
Let the principal amount be x
Find the total interest for the 10 years:
The sum at simple interest rate doubles in 10 years
⇒ The amount at the end of 10 years is 2x
⇒ Interest = 2x - x = x
Find the interest rate for 1 year
Interest in 10 years = x
Interest in 1 year = x ÷ 10 = 0.1x
Find the amount when it is tripled:
Total amount = 3x
Total interest earned = 3x - x = 2x
Find the number of years needed:
Number of years needed = 2x ÷ 0.1x = 20 years
Answer: 20 years
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