Can someone please write this formula for me? I'm trying to create an invoice for my business and it would be loads easier if I had this formula. I've been trying to figure it out on my own for the last 2 hours and I can't seem to get it. If O3 is between 200-299 then P3=$20, if O3 is between 300-399 then P3=$40, if O3 is between 400-499 then P3=$60, if O3 is between 500-599 then P3=$80, if O3 is between 600-699 then P3=$100?

Acase study allows a more detailed look at the life of a single subject than any other study.

Selling a product through an electronic medium is

Why were most movies from the late 1890s until the early 1930s only filmed in black and white? there were only a few people who could afford the technology to produce color motion pictures back then. audiences did not want color motion pictures until later. the film used to make color motion pictures often overheated, which was a safety hazard, so it was generally not allowed. color films had to be hand-colored, frame by frame.