A saleswoman's monthly income has two components, a fixed component of $1000 per month, and a variable component, which is $C for each set of encyclopedias that she sells in that month over a sales target of n sets, where n > 1. How much did she warn 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 encyclopedias, her income in March would have been over $400
Explain your answer please.
E for me
Let A be her total income in March
Let X be the total number of encyclopedias she sold in March
then we have
1000 + (X-N)C = A....(1)
1) 1000 + (X-3-N)C = A - 600
subtracting this eqn from above (1) we can get the value of C.
But still we don't know the value of X
2) insuff alone. (we don't know value of C)
(I didn't understand this sentence, as her fixed component of earning is >1000$
what is meant by over 400$?)
Together insuff as well.