A corporation issued 8% bonds with a par value of $1,230,000, receiving a $66,000 premium. On the interest date 5 years later, after the bond interest was paid and after 40% of the premium had been amortized, the corporation called the bonds at $1,217,700. The gain or loss on this retirement is:

Until recently, hamburgers at the city sports arena cost $4.70 each. the food concessionaire sold an average of 13 comma 000 hamburgers on game night. when the price was raised to $5.40, hamburger sales dropped off to an average of 6 comma 000 per night. (a) assuming a linear demand curve, find the price of a hamburger that will maximize the nightly hamburger revenue. (b) if the concessionaire had fixed costs of $1 comma 500 per night and the variable cost is $0.60 per hamburger, find the price of a hamburger that will maximize the nightly hamburger profit.