83 to 68 is an 18.0723% decrease.
To change any percent into a decimal, multiply the percent by 0.01 (exact); therefore 83 percent = 0.83
83
15.6627% increase.
68% = 0.68 or 68/100 or 17/25
It is a 50% decrease
Yes
You multiply the decimal value by 100: 0.68 x 100 = 68 %
29
Percentage change = (new - original)/original × 100 % = (42.5 - 68)/68 × 100% = -37½ % (Being negative means the change is a reduction.)
An increase of 107.5%
68/100 x 100 = 68
Multiply it by 100 to change it into a percentage and so it is 83%