use a minus sign.

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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 $3,400$ to $3,600$ copies.

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

$($iii$)$ Breakeven appears in the interval of $4,000$ to $4,200$ copies.

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

places.

$

$($d$)$ Consider the following scenarios:

yields the highest profit? Which scenario yields the lowest profit? For subtractive or negative numbers use a minus sign.

Please help almost done just cant figure out the last two