vksunder wrote:

Whenever Martin has a restaurant bill with an amount between 10 and 99 dollars, he calculates the dollar amount of the tip as 2 times the tenth digit of the amount of his bill. If the amount of Martin's most recent bill was between 10 and 99 , was the tip calculated by martin on the bill greater than 15 percent of the amountof the bill?

1. The amount of the bill was between 15 and 50

2. The tip calculated by Martin was 8

Please ..please explain your working. Thanks!

(1) using this condition lowest tip can be 2 on 15 = 40/3 % = 13 %

highest tip can be 10/50 *100 = 20% INSUFFI cannot say whther bill is > 15%

(2) tip=8 => say amt is 10 then 80% tip

say amt is 99 => 8/99 *100 ~8% hence INSUFFI canot be always greater than 15%

(1) and (2) tip=8

if amt =15 => 59% is the tip

if amt = 50 => 16% => least possible percentage is 16% > 15% hence always greter than 15 % SUFFI

IMO C

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