Remark
If the person is healthy, then you can use the 10 to 1 ratio.
Equation
Lymphocytes = 10 * Eosinophiles
Given
Eosinophiles = 2 * 10^2
Solve
Lymphocites = 10 * 2 * 10^2 = 2* 10^(2 + 1) = 2 * 10^3
