Answer:
(C) $111.83
Explanation:
If Sonya buys four pairs of shoes, each on a buy one get one 50% off, that means that we can find the value if she bought ONE deal of buy one get 50% off one, then multiply that by 2 (as if you do the deal, you are paying for two.)
The shoe costs $35, and if we have a 50% discount on it:
![35\cdot0.5=17.5](https://img.qammunity.org/2021/formulas/mathematics/high-school/7k11lzbsd7l6xcs3jg5aq95e420z9h5spd.png)
So the cost of the shoe ON DISCOUNT is 17.50, however the first pair still stays the same.
So the cost of two pairs of shoes using the discount is
![35+17.5 = 52.5](https://img.qammunity.org/2021/formulas/mathematics/high-school/o6qh0udt2xeibvq5beltd4lgena6zny46l.png)
So four pairs cost
![52.5\cdot2 = 105](https://img.qammunity.org/2021/formulas/mathematics/high-school/x6z19lg2os78qk2voxs9m253zzsg20t2nf.png)
However, there is a tax of 6.5%
So we can multiply 105 by 1.065 to get the cost after tax.
![105\cdot1.065=111.825](https://img.qammunity.org/2021/formulas/mathematics/high-school/v4m9dszulu0oceeaui0md0ejjlsjvpusy3.png)
This simplifies down to 111.83.
Hope this helped!