Answer:
$140.48
Step-by-step explanation:
Let x represent dialed units.
We have been given that a quarterly telephone bill consist of $79.15 rental plus 4.7 cents for each dialed unit.
4.7 cents = $0.047
Cost of dialing x units would be .
Total cost of dialing x units would be .
Let us find cost of dialing 915 units by substituting in above expression.
Now, we will find 15% of sales tax as:
Total bill:
Therefore, Mrs. Jonas's bill would be $140.48.