The top or the bottom section??
The payment would be $198.01 and the total interest would be $1,880.75. Pretty straightforward with a financial calc. I can show you the keystrokes if you want, just message.
She should use 50% off.
964 divided by 1/2 = $482
964 - 400 = $564
14.14 cuz that’s the equation for diameter to circumference