3 pairs of socks at 9.99 per pair......3 * 9.99 = 29.97
if u get 15% off, then ur paying 85%
85% of 29.97.....turn percent to decimal..." of " means multiply
0.85(29.97) = 25.47 (thats without tax)
sales tax is 5%...
25.47(1.05) = 26.74 <=== that is the total u would pay, including tax