Aset of 4 tires for a vehicle cost $750. sandra has a coupon for 15% off the cost of the tires, before sales tax. sales tax is 7%. which expression will calculate the total cost of the tires?

a. (750)(0.15)(1.07)
b. (750)(0.85)(1.07)
c. (750)(0.15)(0.07)
d. (750)(0.85)(0.07)

B. (750)(0.85)(1.07)

Step-by-step explanation:

We know that she has a before sales tax discount of 15%. This means she is paying 85% of the full price, or .85.  

Next we have sales tax, at 7%. We have the 1.07 because it is 7% of the price, plus the rest of the cost. 100%(price before tax) + 7% (tax)= 107%, or 1.07.

Answer is B

Total after discount is 750*.85

After tax 750*.85*1.07

1. sometimes

2. never true

3. sometimes

step-by-step explanation:

these are pretty self explanatory if you know what supp right and com angles are