Were you confused by New Math? https://www.youtube.com/watch?time_continue=13&v=PCgo0syhQqU&feature=emb_title
The new math might as well be Chinese, that is how much I understand it. Notice the son's face.
The son looks like, "Every time I let you help me, I get an F. EVERY TIME!!!"
Me @Fred13 , trying to work out percentages and special offers, so I don’t diddle my own pocket! I find it easier to just offer a cheaper specific dates - daily rate, prior to any weekly discount.