A)
if 39.99 is the 100%, what is 10 in percentage? well

solve for "x".
b)
now, with the discount, the amount is 29.99, thus if 29.99 is the 100%, what is 1.95 from it in percentage?

solve for "x".
c)
the original price is 39.99, the markup on that is 60%, how much is that?
well

now, after the discount, the price is 29.99, how much is 23.994 in percentage of 29.99?
well

solve for "x".
Answer: y+0
As y=0 represent x-axis whose slope is 0 and intersects y-axis at the origin.
Step-by-step explanation:
7 x 10^1 = 70
7 x 10^2 = 700
7 x 10^3 = 7000