To calculate tax, you multiply your base price (40 in this case) times (percent/100) so:
40*0.0775 = 3.1. Now, you add this to your original:
40+3.02=43.1. A shortcut:
40*1.0775=43.1.
14.95 plus 6 percent tax = 15.85
1850 plus 6 percent tax = 1961.00
29.98 plus 9.25 percent tax = 32.75
39.99 plus 7 percent tax = 42.79
39.99 plus 9 percent tax = 43.59
97.40 plus 20 percent tax = 116.88
985.00 plus 9.25 percent tax = 1,076.11
14.95 plus 6 percent tax = 15.85
59.99 plus 7 percent tax = 64.19
3.65 plus 8 percent tax = 3.94
39.99 plus 7 percent tax = 42.79
29.98 plus 9.25 percent tax = 32.75
39.99 plus 9 percent tax = 43.59
1850 plus 6 percent tax = 1961.00
3.99 plus 8 percent tax = 4.31
25.78 plus 6 percent tax = 27.33
29.99 plus 6 percent sales tax = 31.79