Percentage amounts can be greater than 100. This simply means that the amount being compared is greater than the original amount.
1. The power rating of a racing car engine is 600bhp (brake horse power). A new engine is rated at 120% of the previous version. What is the power rating of the new engine?
The old engine is 600bhp = 100%
1% of the old engine is 600 ÷ 100 = 6bhp
The new engine is 120% = 120 x 6bhp = 720bhp.
2. Widgets are sold in packs of 50. A special offer is selling widgets in packs that contain 130% of the normal amount. How many extra widgets are in each pack?
The original pack is 50 widgets = 10%
1% of the original pack is 50 ÷ 100 = 0.5 widgets
130% is 130 x 0.5 widgets = 65 widgets
There are 15 extra widgets (65 - 15).