A manager wishes to estimate an average cost equation of the following form:

C = a + bQ + cQ²

Qis the level of output. LettingZ=Q2 and using least-squares estimation, the manager obtains the following computer output:

Given the above information, when output is 20 units, what is average cost?

DEPENDENT VARIABLE: LNW R-SQUARE F-RATIO P-VALUE ON F OBSERVATIONS: 28 0.7679 26.47 0.0001 VARIABLE PARAMETER ESTIMATE STANDARD ERROR T-RATIO P-VALUE INTERCEPT 200 38.00 5.26 0.0001 Q -12.00 4.36 -2.75 0.0111 Z 0.50 0.16 3.13 0.0046