In a certain law firm there are five senior partners and five junior..

For Statement 1, Johnson might get the largest bonus (he might get $5000 while the others get $1 each, say). But he might not, since Statement 1 only means he got more than 40% of the bonus money paid to senior partners. So he might have gotten 41%, another partner might have gotten 56%, and the remaining three 1% each, and he may not have received the largest bonus (or, numerically, he might get $41, and the other bonuses could be $56, $1, $1 and $1, among many other possibilities).

For Statement 2, if the average bonus is a, then the sum of all of the bonuses is 10a. If Johnson's bonus is 5a, then all of the other bonuses add up to 10a - 5a = 5a, and since the bonuses are all positive, they all must be less than 5a. So Johnson must receive the largest bonus, and the answer is B.