Answer:
Last year, Donald earned $10,000.
Step-by-step explanation:
Let us assume the Donald's earnings last year = $ m
The income taxes = 25% of the salary
Now, It is given that the tax paid last year = $2,500
⇒ 25% of m = $2,500
Solving for the value of m, we get
[tex]\frac{25}{100} \times m = 2,500\\ \implies m = 2,500 \times 4 = 10,000[/tex]
or, m = $10,000
Hence, the last year earnings of Donald = $10,000