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A gallon of milk was $1.79 two years ago. Today, it's $2.15. Find the rate it increased each year. 
The rate of increase problem is a mathematical concept that involves determining the rate at which a quantity is increasing over a certain period of time. It is commonly used in various fields such as finance, economics, and population studies.
The rate of increase is calculated by dividing the change in the quantity by the initial quantity and then multiplying by 100 to express it as a percentage. The formula is: (final amount - initial amount) / initial amount * 100.
The rate of increase can be affected by various factors, such as the initial quantity, the time period, and any external influences or interventions. It can also be affected by the type of growth, whether it is linear or exponential.
The rate of increase problem is used in many real-life scenarios, such as predicting population growth, calculating compound interest in finance, and analyzing economic trends. It is also used in fields like epidemiology to track the spread of diseases.
Some strategies for solving rate of increase problems include identifying the initial quantity and final quantity, determining the time period, and using the appropriate formula. It is also helpful to understand the type of growth and any external factors that may be influencing the rate of increase.