Question

A used-car dealership buys a car for $2800 and then sells it for $4300. What is the percent increase?

Answer 1

The increase is 53,57%.

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