My teacher doesn't explain much of anything and i'm completly confused how to do these problems, any help is very much apperciated

1. A wool suit, discounted by 75% for a clearance sale has a price tag of 156 what was the suits original price?

2. 45 is 90% of what?

3.The sum of the measurements of two complementary angles is 90 degrees, if one angle measures 6 degrees more than twice the measure of the other, find the measure of the smaller angle.

4.The perimeter of a college athletic field is 96 meters and the length is 16 m more than the width, Find the length and the width