Answer:
Sales revenue = $500,000
Step-by-step explanation:
Below is the calculation:
Formula for variable cost ratio = Total variable expenses (Total variable cost) / Net Sales = 40%
40% = Total variable cost / Net Sales 
 Total variable cost = 0.40 Net sales 
 Operating income = Total revenue - fixed cost - variable cost 
 100,000 = Total revenue - 200,000 - 0.40 total revenue 
 300,000 = 0.60 total revenue 
 Total Revenue = 300,000/ 0.6 
 Sales revenue = $500,000