Exercises 61–64 describe a number of business ventures. For each exercise,

a. Write the cost function, C.

b. Write the revenue function, R.

c. Determine the break-even point. Describe what this means.

You invested $30,000 and started a business writing greeting cards. Supplies cost 2¢ per card and you are selling each card for 50¢. (In solving this exercise, let x represent the number of cards produced and sold.)