A scarf costs $12. What is 6% sales tax on a scarf

Since you are asking solely for the 6% OF the $12 you must multiply. 12*0.06=0.72. The sales tax would be $0.72 but if you want the total price for the scare then you would add 12+0.72 and get $12.72. The 6% sales tax of the $12 is $0.72 and the total is $12.72.