Answer:
1) The Monthly payment is 220.06.
2) The Monthly payment is 73.24.
Explanation:
1) Given : Sharon will borrow $3400 at 11% APR. She will pay it back over 18 months. 
To find : What will her monthly payment be? 
Solution : Amount is $3400 , APR = 11% , Time= 18 months 
From the table 1 we can see at 11% APR and in 18 months the interest per $100 is 16.50 (Marked in attached table 1) 
So, The total interest is 

The Monthly payment is 
 
 
 
 
Therefore,The Monthly payment is 220.06 Option B is correct.
2) Given : Patrick will borrow $4300 at 11.5% APR. He will pay it bak over 5 years.
To find : What will her monthly payment be? 
Solution : Amount is $4300 , APR = 11.5% , Time= 5 years
From the table 2 we can see at 11.5% APR and in 5 years the interest per $100 is 2.199 (Marked in attached table 2) 
So, The total interest is 

The Monthly payment is 
 
 
 
 
 Therefore,The Monthly payment is 73.24.