You can sell 100 pet chias per week if they are marked at $1 each, but only 40 each week if they are marked at $2/chia. Your chia supplier is prepared to sell you 30 chias each week if they are marked at $1/chia, and 70 each week if they are marked at $2 per chia.
(a) Write down the associated linear demand and supply functions
demand function
supply function
At what price should the chias be marked so that there is neither a surplus nor a shortage of chias