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What are the key factors influencing consumer behavior in the e-commerce industry, and how do they contribute to the success of online businesses?"

What is the financial 

Question 1. Design a DAC using inverting OPAMP for 3-bit binary value and verify the analog output for the same

Take: Rf=1MΩ

            R=1KΩ

            Vref= -5 V

Preble Company manufactures one product. Its variable manufacturing overhead is applied to production based on direct labor-hours and its standard cost card per unit is as follows:

The company also established the following cost formulas for its selling expenses:

The planning budget for March was based on producing and selling 28,000 units. However, during March the company actually produced and sold 33,000 units and incurred the following costs:

1. Purchased 165,000 pounds of raw materials at a cost of $7.20 per pound. All of this material was used in production.

2. Direct-laborers worked 58,000 hours at a rate of $13.00 per hour.

3. Total variable manufacturing overhead for the month was $729,060.

4. Total advertising, sales salaries and commissions, and shipping expenses were $240,000, $470,000, and $145,000, respectively.

10. What is the variable overhead efficiency variance for March? (Indicate the effect of each variance by selecting "F" for favorable, "U" for unfavorable, and "None" for no effect (i.e., zero variance.). Input the amount as a positive value.)