Mohan lends Rs. 500 to John and a certain sum to Tom at

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Mohan lends Rs. 500 to John and a certain sum to Tom at the same time at a simple interest of 8% per annum. If in 4 years, he altogether receives Rs. 210 as interest from the two, then the sum of money he lent to Tom was

Let the money lent to Tom be Rs. p.
As we know that ,

Simple interest =	Principal × Time × Rate
	100

∴	500 × 8 × 4	+	p × 8 × 4	= 210
	100		100

⇒ 160 +	32p	= 210
	100

32p	= 210 - 160 = 50
100

⇒ p =	50 × 100	= Rs. 156.25
	32