The cost of a gallon of milk used to be 2.25. the price has increased to 115 percent of what it was. what is the approximate new price?

So if the was 2.25 and it has increased 115% that means that it has doubled but also has increased by 15% so the new price should be 

2.25+2.25+ (15% of 2.25) 

= 4.50 + 0.3375 

= 4.83375 

Cis your correct answer