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 n sets. How much did she earn in March?
(1) If she had sold three fewer sets, her March income would have been $600 lower.
(2) If she had sold 8 sets of encyclopaedias, her income in March would have been over $4000
I. implies, either C = 600, or 2C = 600, or 3C = 600
II. C(8-n) > 4000 --insufficient
Assuming, n to be a non-zero no. we get n = 1, C = 600, => sufficient