The percent symbol means 'divided by 100' which means that the decimal point has to be moved two places to the left. The following examples demonstrate this:
2% 
= 

= 
0.02 
15% 
= 

= 
0.15 
150% 
= 

= 
1.5 
200% 
= 

= 
2 
12½% 
= 
12.5% 
= 

= 
0.125 

= 

= 
0.33 
correct to 2 decimal places 
Examples:
15% of £60 is the same as 

of £60 which is: 
4% of 150ml is the same as 

of 150ml which is: 

× 150ml = 0.04 × 150ml = 6ml 
Percentages which are more than 100% are less often found, but they can be interpreted in the usual way.
200% of £40 is the same as 

of £40 which is: 
Similarly; 120% of 50g is the same as


× 50g = 1.2 × 50g = 60g 