# Basic percentages
15% of 200
200 + 10%
200 - 10%
5% on 200
5% off 200

# Percentage of value
50 as a % of 100
20 as a % of 200

# Percentage change
50 to 75 is what %
40 to 90 as %

# Reverse percentage
180 is what % off 200
180 is what % on 150
20 is what % of 200

# Reverse lookup
20 is 10% of what
220 is 10% on what
180 is 10% off what

# Decimal to percentage
0.35 as %
1 as %

# Division to percentage
20/200 as %
20/200 %

# Edge cases
0% of 100
100% of 250
200% of 50
100 - 100%
