Here is your equation:
yhat = 7.88 - 0.05x
Substitute 55 for x and solve for yhat (that will be your predicted value).
I'll show you how this is done:
yhat = 7.88 - 0.05(55) = 7.88 - 2.75 = 5.13
yhat = 5.13 (cost per unit)
I hope this helps.
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