Price of 3 shirts=$18*3=$54 Price of 2 pair of socks=2*$3.99=$7.98 Price of a pair of slack=$45 Total amount- $54+$7.98+ $45-$106.98 Sales tax rate = 8.5% 8.5% of total amount-8.5% of $106.98= (8.5/100)*106.98-9.0933 Total amount Rick paid=$106.98+9.0933=$116.0733 Regards