Answer : The percentage will be, 200%
Step-by-step explanation :
First we have to calculate the excess weight.
Excess weight = 45 kg - 15 kg
Excess weight = 30 kg
Now we have to calculate the percentage of excess weight.
Percentage of excess weight = 
Percentage of excess weight = 
Percentage of excess weight = 200 %
Therefore, the percentage will be, 200%