Using the chain ratio method, estimate the market sales potential for heart catheterization products to meet the needs of the infant and child segment. Assume that of the 45,000 children with heart defects each year, 45 percent will benefit from these types of products and that only 50 percent of their families have the financial resources to obtain such treatment. Also assume the average price for a device is $1,500 and children may only go through a single procedure.

The number of buyers in the market can be estimated as _