AdminKeymaster
December 30, 2020 at 9:39 pm
Post count: 1622
Sophie’s telephone bill for the period ending 15th July was $125.30.
The following additional information below was included in her latest account.
| Calling Patterns From Last Bill |
| Local Calls |
down by |
$17.50 |
| STD Calls |
up by |
$10.30 |
| Calls to Mobiles |
up by |
$0.75 |
| 0011 International Calls |
down by |
$5.40 |
Use this information to calculate the total of her bill for the previous month.
a. $91.35
b. $113.45
c. $137.15
d. $159.25 |
-$17.50 + $10.30 + $0.75 – $5.40
= -$11.85 |
local calls = -$17.50 since it was down, it is negative
STD = +$10.30 up by 10.30, so positive
Mobiles = $0.75 up so positive
International = -$5.40 down, negative
|
|
$125.30 + $11.85 = $137.15
C
|
this bill was down by $11.85 (since it is negative) so the last bill must be $11.85 more expensive
add them together
|
