# The American Booksellers Association, which represents independent booksellers, includes 1500 businesses at 2500 locations. Twenty years ago it represented 4700 businesses at 5500 locations; what is the percent change in the number of businesses and locations represented?

Unitary Method

The word “unitary” comes from the word “unit”, which means a single and complete entity. In this method, we find the value of a unit product from the given number of products, and then we solve for the other number of products.

Speed, Time, and Distance

Imagine you and 3 of your friends are planning to go to the playground at 6 in the evening. Your house is one mile away from the playground and one of your friends named Jim must start at 5 pm to reach the playground by walk. The other two friends are 3 miles away.

Profit and Loss

The amount earned or lost on the sale of one or more items is referred to as the profit or loss on that item.

Units and Measurements

Measurements and comparisons are the foundation of science and engineering. We, therefore, need rules that tell us how things are measured and compared. For these measurements and comparisons, we perform certain experiments, and we will need the experiments to set up the devices.

The American Booksellers Association, which represents independent booksellers, includes 1500 businesses at 2500 locations. Twenty years ago it represented 4700 businesses at 5500 locations; what is the percent change in the number of businesses and locations represented?

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