In the 1920s, a gallon of milk cost on average $0.35. The current average price of a gallon of milk is $4.20. What is the percent of increase in the average cost of a gallon of milk in the 1920s to today
To find the percent increase, we need to find the difference in price between the two time periods and then divide that difference by the original price.
The difference in price is $4.20 - $0.35 = $<<4.20-0.35=3.85>>3.85.
To find the percent increase, we divide the difference by the original price and multiply by 100%.
Percent increase = ($3.85/$0.35) x 100% = 1100%.
Therefore, the average cost of a gallon of milk has increased by 1100% from the 1920s to today.