Not hard at all. To change a decimal to a percent, simply move the decimal to the right two places:
20 in percent = 2000%
+20%
17/20 to a decimal and a percent = 0.85; 85%
20% is .2 as a decimal.
20/100 = 0.2
-25%
13/20
15% decrease
The increase is 150%.
20% increase.
20% decrease.
1/5