Answer: 400%
Step-by-step explanation: To find the percent increase, we divide the amount of change by the original number.
The amount of change is the difference between the 2 numbers which in this case is 60 - 12 or 48. The original number is 12.
So we have 48/12 which is 4.
Finally, remember that we want the percent increase.
So we need to write 4 as a percent by moving the decimal point two places to the right to get 400%. So when a number changes from 12 to 60, there's a 400% increase.