The difference between the compound and simple interest

m.gayatri · 26-01-07, 06:04 PM

The difference between the compound and simple interest on a certain sum for 2 years at the rate of 8% per annum is Rs.80,What is the sum?
A)11,880 B)12,500 C)13,250 D)14,270

realtime · 26-01-07, 08:44 PM

C.I = x(1 + 8/100)^2 - x

=> C.I = 104x/625

S.I = ( x * 2 * 8 )/100 = 4x/25

(C.I) - (S.I) = 4x/625

Given 4x/625 = 80

=> x = 12,500

realtime · 26-01-07, 08:45 PM

Quote:

Originally Posted by realtime

C.I = x(1 + 8/100)^2 - x

=> C.I = 104x/625

S.I = ( x * 2 * 8 )/100 = 4x/25

(C.I) - (S.I) = 4x/625

Given 4x/625 = 80

=> x = 12,500

26-01-07, 06:04 PM	#1 (permalink)
m.gayatri Senior Member Join Date: Jan 2007 Age: 23 Posts: 1,030 Thanks: 0 Thanked 2 Times in 2 Posts Thanks: 0 Thanked 2 Times in 2 Posts Rep Power: 12	The difference between the compound and simple interest The difference between the compound and simple interest on a certain sum for 2 years at the rate of 8% per annum is Rs.80,What is the sum? A)11,880 B)12,500 C)13,250 D)14,270

26-01-07, 08:44 PM	#2 (permalink)
realtime Junior Member Join Date: Jan 2007 Age: 23 Posts: 8 Thanks: 0 Thanked 0 Times in 0 Posts Thanks: 0 Thanked 0 Times in 0 Posts Rep Power: 2	Re: The difference between the compound and simple interest C.I = x(1 + 8/100)^2 - x => C.I = 104x/625 S.I = ( x * 2 * 8 )/100 = 4x/25 (C.I) - (S.I) = 4x/625 Given 4x/625 = 80 => x = 12,500

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