Question

Kevin purchased a hat for
x
dollars and a shirt for
y
dollars. The total cost,
t
, in dollars, of the items including sales tax and a flat rate shipping cost of
s
dollars is represented by the equation
t
=
1.08
(
x
+
y
)
+
s
.



Which equation represents the total cost of the hat and shirt before tax or shipping?



A.
x
+
y
=
t
−
s
1.08

B.
x
+
y
=
t
1.08
−
s

C.
x
+
y
=
1.08
t
+
s

D.
x
+
y
=
t
−
(
1.08
+
s
)

Answer 1

Start with t = 1.08(x + y) + s. Subtract s: t − s = 1.08(x + y). Divide by 1.08: x + y = (t − s)/1.08.

Answer: A.