Answer: 1) Means multiple the initial by 2. Doubling effect.
2) 50%
3) 33%
4) $349.3
Explanation:
1) Example. 100% increase is doubling. If you have $2 and it increases by 100% you will have $4
2) (18-12)/12 × 100
3) (18-12)/18 × 100
4) 499 - {(30/100) × 499