Use a data table to vary demand from $1,000$ to $6,000$ in increments of $200$ to test the sensitivity of profit to demand. Breakeven occurs where profit goes from a negative to a positive value, that is$,$ breakeven is where total revenue $=$ total cost yielding a profit of zero. In which interval of demand does breakeven occur?

$($i$)$ Breakeven appears in the interval of $3,800$ to $4,000$ copies.

$($ii$)$ Breakeven appears in the interval of $4,200$ to $4,400$ copies.

$($iii$)$ Breakeven appears in the interval of $4,400$ to $4,600$ copies.

$($iv$)$ Breakeven appears in the interval of $4,600$ to $4,800$ copies.