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A company discovers that to produce

\displaystyle {x}=

900 new electronic parts, it will cost

\displaystyle {y}=

$91300. To produce 630 new electronic parts, it will cost $65380.

Compute the slope of the costs and choose the most accurate statement from the following:

Costs are increasing at a rate of $102 per item.
Costs are increasing at a rate of $98 per item.
Costs are increasing at a rate of $96 per item.
Costs are decreasing at a rate of $96 per item.
Costs are decreasing at a rate of $102 per item.
Costs are decreasing at a rate of $98 per item.

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