The Table Shows How the Salary of an Individual Will $\quad \quad \quad \quad \quad \text { A changing Measuring Stick }$

The table shows how the salary of an individual will increase after 40 years and how price level will increase for the same period. What will be the real income x for the individual in 2060? $\quad \quad \quad \quad \quad \text { A changing Measuring Stick }$

$\begin{array}{|c|c|c|c|}\hline \text { Year } & \begin{array}{c}\text { Nominal } \\\text { Income }\end{array} & \begin{array}{c}\text { Price } \\\text { Level }\end{array} & \begin{array}{c}\text { Real } \\\text { Income }\end{array} \\\hline 2020 & \$ 30,000 & 1.0 & \$ 30,000 \\\hline 2060 & \$ 180,000 & 3.0 & \mathbf{X} \\\hline\end{array}$

A) $90,000
B) $60,000
C) $540,000
D) $150,000