a cellular phone company charges a caller 10 for every call during the first minute and 8 for each succeeding minute or a fraction there of. how much will be charged if a cellular used the phone for 5 minutes?
Answers
Answer:
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Answer:
The formula need to solve this problem is:
c
=
f
+
(
v
⋅
t
)
Where:
c
is the total cost of the call,
$
6.40
for this problem
f
is the fixed cost of the call for the first minute,
$
0.40
for this problem.
v
is the variable cost for each additional minute of the call,
$
0.30
for this problem.
t
is the time of the call in minutes, what we are solving for in this problem.
We can now substitute as solve for
t
as follows:
c
=
f
+
(
v
⋅
t
)
becomes:
$
6.40
=
$
0.40
+
(
$
0.30
⋅
t
)
$
6.40
=
$
0.40
+
$
0.30
t
−
$
0.40
+
$
6.40
=
−
$
0.40
+
$
0.40
+
$
0.30
t
$
6.00
=
0
+
$
0.30
t
$
6.00
=
$
0.30
t
$
6.00
$
0.30
=
$
0.30
t
$
0.30
20
=
$
0.30
t
$
0.30
20
=
t
t
=
20
You talked for 20 minutes at the $0.30 per minute variable rate plus the first minute at $0.40 so you talked for a total of 21 minutes