Answer:
360,0000 dollars
Explanation:
Way 1: Multiply.
90,000 times 10.
You get 900000.
Do this 3 more times and you get your answer.
Way 2: Add/Multiply
Multiply 90,000 times 10.
You get 900,000.
Add that repetitively 3 more times.
You get 360,0000 dollars both ways.