((y2 - y1) / y1)*100 = your percent change. y1 is the original value, and y2 is the value it changed to.

Using the formula for percentage change, and following the order of operations

- Subtract (42 - 5) which gives you: 37
- Divide 37 / 5 which gives you: 7.4000000000
- Multiply 7.4000000000 * 100 = 740