You don't have enough information to answer this question. You need to know how many of each of these Alexi and Tony can sell. Even though tacos bring in less revenue per unit, if the demand is great enough, tacos can still be the most profitable overall. 
For example: Say they can sell 20 tacos per hour but only 2 cuban sandwiches per hours. They would make $40 per hour in tacos but only $14.50 in sandwiches. 
 
        
             
        
        
        
Answer:
It is $9,450 (A)
Explanation:
Return on Investment = 40% * $ 45,000
                                      =$18,000
Minimum Required Return = 19% *$ 45,000
                                             = $8,550
Hence, Residual Income = $18,000-$8,550
                                          =$9,450
Minimum required return represents the amount of returns that must be generated on investment to satisfy the expectations of providers of funds.
Residual income is what is left after dividends and interest have been paid to the various investors which can be retained for future investment.
 
        
             
        
        
        
Answer: 
Explanation: from the above question, the total of cash and cash equivalent to be recorded in the balance sheet includes all cash balances in the bank and cash balance in the petty cash account.
From the above question, the cash and cash equivalent balance as at April 30 is $1,000 plus all bank balances as at that date.
 
        
             
        
        
        
The convexity of the bond is 61.810 and the duration of the bond is 7.330 years.                                                                                                      
<u>Explanation</u>:
-  A newly issued bond has a maturity of 10 years. It pays a 7.7% coupon rate. The coupon payments will receive each year. Using the coupon payments the year will be reduced. 
- The maturity year will get reduced. So the duration of the bond is approximately 7.330 years. If the bond is sold at par value the convexity can be calculated using the number of years.
- So the convexity of the bond is 61.810.