Question

A sum of Rs 1,780 becomes Rs 2,136 in 4 years. Find:
(i) The rate of interest.
(ii) The sum that will become Rs 810 in 7 years at the same rate of interest.​

Answer 1

Answer:

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Answer 2

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$\mathbf{\underline{given}}$

• Principle (P) = 1780
• Amount (A) = 2136
• Number of year(N) = 4
• rate of interest (R) = ?
• interest = 2136-1780 = 356

$\mathbf{\underline{solution \: 1}}$

• I = PRN/100
• 356 = 1780×R×4/100
• 356 = R×71.2
• R = 356÷71.2
• R = 5%

$\mathbf{\underline{solution \: 2}}$

• I = PRN/100
• 810-x = x×7×5/100
• 810-x = 35/100x
• 810 = (0.35+1)x
• x = 810/1.35
• x = 600 rs

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