Markup and markdown assignment

Question

The co-op boast that it has 5,100 members and 205% increase in sales. The markup is 41% based on cost. What would be its percent markup if selling price were the base?

Answer 1

we need mark up on sales but there is no mark up but there is a margin on sales

So

let margin on sales be m

profit is mS=.41x.

S-x=..41x

m(.41x+x)=.41x

m= .41/1.41

m=.291