Chart read-off Numerical Reasoning Question

Read values against the gridlines carefully; for stacked segments, subtract the boundary values to get the segment itself. The correct answer is 100. Traps to avoid: 75 comes from the "one gridline too low" error; 225 comes from the "read adjacent category" error; 112 comes from the "misread between gridlines" error; 125 comes from the "one gridline too high" error.