A saleswomanâ€™s monthly income has two components, a fixed component of $1000 per month, and a variable component, which is $C for each set of encyclopaedias that she sells in that month over a sales target of 3 sets. How much did she earn in March?
(1) If she had sold three fewer sets than she actually did, her March income would have been $600 less.
(2) If she had sold 8 sets of encyclopaedias, her income in March would have been over $4000
I get A here
Let n be the # of copies that she sells
we know that her income is (n-3)*C + 1000 for any given month----(I)
(1) says that If she actually sells 3 copies less than actually she did then
her income is less by $600
So (n-6)*C + 1000 ------------------(II)
From (I) and (II) we get her March income
From (2) in the given premise
we have 5*C + 1000 > 4000
But we cannot tell exactly how much she got ...
So IMO it is A