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.
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39.99 plus 9 percent tax = 43.59
39.99 plus 7 percent tax = 42.79
59.99 plus 7 percent tax = 64.19
1850 plus 6 percent tax = 1961.00
29.98 plus 9.25 percent tax = 32.75