This question refers to the following table.Annual Teacher SalariesTier 1$45,256Tier 2$57,254Tier 3$72,978Hazel estimated the sum of these tiered salaries by first rounding each to the nearest thousand. Ivan estimated the sum of these salaries by first rounding each to the nearest ten. By how much do these estimates differ?

The California Basic Educational Skills Test (CBEST) is a standardized test administered in the state of California.

CBEST Mathematics test contains 50 multiple-choice questions which require candidates to solve problems from three major areas: Estimation, Measurement, and Statistical Principles; Computation and Problem Solving; and Numerical and Graphic Relationships.