Answer:
25%
Step-by-step explanation:
formula for percent markup/discount= absulute value of original-new/original
plug the numbers is
(2.40-3.00/2.40) absolute value=0.25
0.25 as a percent is 25%
an = a1 +d(n-1)
a4 =a1+d(4-1)
-4 = -1+d(3)
add 1 to each side
-3 = 3d
d= -1
an = -1 +-1 (n-1)
an = -1 -n +1
an = -n
Choice D
