A number increased by 25% and the result is 9000. What was the original number? A. 2250 B. 7200 C. 36000 D. 11250

Option B, 7200

Step-by-step explanation:

Step 1: Make an expression

A number increased by 25% and the result is 9000.

x * (1 + 0.25) = 9000

x * (1.25)

1.25x = 9000

Step 2: Divide both sides by 1.25

1.25x / 1.25 = 9000 / 1.25

x = 7200

Answer: Option B, 7200