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Laureano · Answer 1 · 2019-11-27T11:01:22+0000

Inequality, because want to know when we'll make a profit.

$d (- 680+ 960) \geqslant 52000 \\ 280d \geqslant 52000$
Profit: Let's See When 280d equals 52000

$d \geqslant (52000)/(280) \\ d \geqslant 185.71$
So, after 190 days Julianne will make a profit

$280(190) \geqslant 52000 \\ 53200$

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