What is the least common multiple of 12 and 52

Plz me i need i will give a brain

If the value of cos330°is√3/2 then find cos 165°.

Kim took out a $55,000 loan for college she is borrowing money from 2 banks bank a charges an interest rate of 8% and b charges an interest rate of 11% after one year kim owes 5000 in interest how much money did she borrow from bank a.