ABC = 0.07m + 18
XYZ = 0.10m + 9
you want ABC = XYZ, so
.07m + 18 = .1m + 9
7m + 1800 = 10m + 900
-3m = -900
m = 300
So at 300 minutes the charge would be the same from each company
XYZ = 0.10m + 9
you want ABC = XYZ, so
.07m + 18 = .1m + 9
7m + 1800 = 10m + 900
-3m = -900
m = 300
So at 300 minutes the charge would be the same from each company
Let's assume the number of minutes of phone calls made in a month is 'x'.
For ABC phone company, the cost of phone calls in a month would be 7 cents multiplied by 'x'.
So, the cost for ABC phone company in a month would be $18 + 0.07x.
For XYZ phone company, the cost of phone calls in a month would be 10 cents multiplied by 'x'.
So, the cost for XYZ phone company in a month would be $9 + 0.10x.
To make the costs the same, we can set up the equation:
$18 + 0.07x = $9 + 0.10x
Now, let's solve for 'x' to find the number of minutes of phone calls:
$18 - $9 = 0.10x - 0.07x
$9 = 0.03x
Dividing both sides by 0.03:
$9 / 0.03 = x
300 = x
Therefore, to make the costs the same for both companies, you would need to make 300 minutes of phone calls each month.
Let's represent the number of minutes of phone calls as "m".
For ABC phone company:
Cost = $18 (monthly charge) + $0.07 (per minute charge) * m (number of minutes)
Cost = $18 + $0.07m
For XYZ phone company:
Cost = $9 (monthly charge) + $0.10 (per minute charge) * m (number of minutes)
Cost = $9 + $0.10m
Now, we can set these two costs equal to each other and solve for "m":
$18 + $0.07m = $9 + $0.10m
Simplifying the equation, we get:
$0.07m - $0.10m = $9 - $18
-$0.03m = -$9
Dividing both sides of the equation by -$0.03, we get:
m = -$9 / -$0.03
Simplifying the expression, we get:
m = 300
Therefore, 300 minutes of phone calls should be made each month to make the costs for ABC and XYZ phone companies the same.