Eight members of a club donate Rs. 100 each towards a Relief

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Eight members of a club donate Rs. 100 each towards a Relief Fund and the President of the club donates Rs. 50 more than the average donation of all (including President) of them. Then the contribution of the president is

1. Rs.106.25
2. Rs. 156.25
3. Rs. 56.25
4. Rs. 206.25

Correct Option: B

Let the contribution of president be Rs. p.
According to the question,

⇒ p –	p + 800	= 50
	9

⇒	9p - p - 800	= 50
	9

⇒ 8p – 800 = 50 × 9
⇒ 8p = 450 + 800 = 1250
⇒ p = 1250 ÷ 8 = Rs. 156.25