On January 1, 2018 when the effective interest rate was 14%, a company issued bonds with a maturity value of $1,000,000. The stated rate of interest is 12%, the bonds pay interest semi-annually and sold for $893,640. The amount of bond discount amortized on July 1, 2018 is approximately:

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.