I really appreciate any help! So I used to know how to solve direct variation but I kinda forgot so I would adore a real quick explanation, though you don't have too of course!

Divide the following fractions 3/4 ÷ 2/3 1/2 8/9 9/8 2

15/16 as a decimal rounded to the nearest hundredth

Celeste wants to have her hair cut and permed and also go to lunch. she knows she will need $50. the perm cost twice as much as her haircut and she needs $5 for lunch. how much does the perm cost?