Sonya buys four pairs of shoes on sale for buy one, get one 50% off. the sales tax is 6.5%. if the original price for each pair of shoes was $35, how much does sonya pay for the four pairs altogether?

Sonya pays $111.825 for the four pairs altogether.

Step-by-step explanation:

The original price for each pair of shoes was $35.

The sale offers "buy one, get one 50% off".

That means, for first two pairs of shoes, the total original price  

Similarly, for next two pairs of shoes, the total original price  

So, the total original price for 4 pairs of shoes  

The sales tax is 6.5% . So, the amount of sales tax  

Thus, the total amount Sonya need to pay for the four pairs altogether