Joey borrowed the money for 4 months. 2000 multiplied by .05 comes out to 100 which is the 5% so for him to get to 400 he had to owe the money for 4 months to pay 400 in interest. Hope this helps.
It's kinda hard because there is no z table available, but we can estimate around 1.64
p[95] = 664.4853
either 660 or 670
1.64 (100) = 164 + 500 = 664
i'd say that if you're within the p[95] the Score wil be 660
Hope this helps
The answer is 90 degrees hope this helps