At the beginning of the year, an audio engineer quit his job and gave up a salary of $175,000 per year in order to start his own business, Sound Devices, Inc. The new company builds, installs and maintain custom audio equipment for businesses that require high-quality audio systems. A partial income statement for the first year of operation for Sound Devices, Inc., is shown below:

Revenues

Revenue from sales of product and services .........$970,000

Operating costs and expenses

Cost of products and services sold.....................$355,000

Selling expenses......................................................$155,000

Administrative expenses...........................................$45,000

Total operating costs and expenses.....................$555,000

Income from operations..........................................$415,000

Interest expense(bank loan)......................................$60,000

Legal expenses..............................................................$88,000

Corporate income tax payments.............................$90,000

Net income...................................................................$ 177,000

To get started, the owner of Sound Devices spent $100,000 of his personal savings to pay for some of the capital equipment used in the business. During the first year operation, the owner of Sound Devices could have earned a 15 percent return by investing in stocks of other new businesses with risk levels similar to the risk level at Sound Devices.

a. What are the total explicit, total implicit, and total economic costs for the year?

b. What is accounting profit?

c. What is economic profit?

d. Given your answer in part c, evaluate the owners's decision to leave his job to start Sound Devices.