Answer:
The increase is 53,57%.
Step-by-step explanation:
This problem is solved by the rule of 3. It's necessary verify the proportionality. On the both sides it's directly propose, so it's necessary multiply crossed:
2800 _____> 100%
4300 _____> x
2800 * x = 4300 * 100
x = (4300 * 100)/2800
x = 153,57%
153,57% - 100% = 53,57%, that's the answer
