The LP problem whose output follows determines how many necklaces, bracelets, rings, and earrings a jewelry store should stock.$$ The objective function measures profit: it is assumed that every piece stocked will be sold.$$ Constraints measure display space in units, time to set up the display in minutes and two marketing restrictions.

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$$ MAX$100$N$+120$B$+150$R$+125$E

$$ N$+2$B$+2$R$+2$E$<=108$ Space

$3$N$+5$B$+$ E$<=120$ Time

$$ N$+$ R$<=25$ Market Restriction $1$

$$ B$+$R$+$E$>=50$ Market Restriction $2$

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Use the output to solve and answer the following question.

By how much can the profit on rings increase before the solution would change?

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Group of answer choices

$25$

$12\mathrm{.}5$

$17$

$15\mathrm{.}75$