If the simple interest on a certain sum of money for 15

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If the simple interest on a certain sum of money for 15 months at 7 1 %
2
per annum exceeds thesimple interest on the same sum for 8 months at
12 1 % per annum by ₹32.50, then the sum of money (in ₹) is :
2

Let the sum be y.
We find the required answer with the help of given formula,

SI =	PTR
	100

⇒	y × (15 /12) × (15 / 2)	-	y × (8 / 12) × (25 / 2)	= 32.50
	100		100

⇒	25y	= 32.50
	2400

⇒ y =	32.50 × 2400	= 3120
	25

∴ Required sum = 3120

12	1	% per annum by ₹32.50, then the sum of money (in ₹) is :
	2