the simple interest on a certain sum at 5% per annum for 3 years and 4 years differ by rs. 42. the sum is
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The answer is 840.
Let the sum be x.
Case 1:x*3*5/100=0.15x
Case 2:x*4*5/100=0.20x
Difference of Interests=₹42
=>0.20x-0.15x=0.05x
=>0.05x=42
=>x=42/0.05
=>x=42*100/5
=>x=₹850
Hence, the sum is ₹850
Let the sum be x.
Case 1:x*3*5/100=0.15x
Case 2:x*4*5/100=0.20x
Difference of Interests=₹42
=>0.20x-0.15x=0.05x
=>0.05x=42
=>x=42/0.05
=>x=42*100/5
=>x=₹850
Hence, the sum is ₹850
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