1. The monthly cost of heating our company office is a fixed cost, a CEO says, "because we adjust the thermostat according to the weather conditions which are beyond our control." Do you agree? Is this a variable cost? Explain your ground concisely.

2. At Q company, the annual depreciation expenses for the production equipment are computed under an accelerated depreciation method, resulting in annually changing depreciation amounts. with respect to the production volume, the depreciation amount total level is a ____ cost. Then, explain your ground concisely below.