PLZ HELP ASAP Show all work

a) 198.7% interest

Not too sure about answer to (b)

b) 4.75% annualized  

Step-by-step explanation:

a) i used Interest = Principal x Rate x Time

   40 = 525 x x r

    40 = 20.13r

    r = 1.987 or 198.7%

b) i used this proportion:   =      'x' represents annualized rate

                                                             1/24 represents 2 weeks out of a year

1/24x = 1.98

x = 4.75%

i think the correct option is the second option.

x = 3 ± √(5+y)