Portland and Hadley operate in the same industry. Portland’s sales, variable costs, and fixed costs are $1,000,000, $700,000, and $100,000, respectively. Hadley’s sales, variable costs, and fixed costs are $1,000,000, $400,000, and $400,000, respectively. If each company experiences an equal increase or decrease in sales, Hadley’s income willA: Go up twice as much as Hadley’s, but go down only half as much as Hadley’s.B: Go up or down twice as much as Hadley’s.C: Go up or down by the same amount as Hadley’s because both companies have equal net income.D: Go up or down half as much as Hadley’s.