Final answer:
To buy all three pairs of shoes, you would need $156.12, which is the total cost after applying the discount and including the sales tax.
Step-by-step explanation:
To calculate the total cost of buying all three pairs of shoes, we need to find the cost of each pair and then apply the discount. The original price of each pair of shoes is $59.95. Since there are three pairs, the total cost without any discount is 3 * $59.95 = $179.85.
Next, we need to calculate the discount. The discount is 20% if you buy two or more pairs. Since we are buying three pairs, we will apply the discount to the total cost.
The discount amount is 20% of $179.85, which is 0.20 * $179.85 = $35.97. Subtracting the discount amount from the total cost, we get the final cost of $179.85 - $35.97 = $143.88.
Finally, we need to add the sales tax. The tax rate is 8.5%, so the tax amount is 8.5% of $143.88, which is 0.085 * $143.88 = $12.24. Adding the tax amount to the final cost, we get the total amount needed to buy all three pairs of shoes as $143.88 + $12.24 = $156.12. Therefore, the correct answer is not provided among the options given.