Trouble with problems

[davewillis2010]

working off an 18% margin, with markups based on cost, the Food Co-op Club boasts that they have 5000 members and a 200% increase in sales. the markup is 36% based on cost. What should be their percent markup if selling price were the base? Round to nearest hundredth percent.

and

Jim Abbott purchased a 60000 RV with a 40% markup on selling price. What was the amount of the dealer's markup? What was the dealer's original cost?

 

[davewillis2010]

1st one I have know idea where to begin.....

2nd one this is what I have so far:

60000 = c + .40(60000)
60000 = c + 24000
60000-24000 = c + 24000-24000
36000 = c

so A= 24000
so B= 36000

 

[davewillis2010]

Working off an 18% margin, with markups based on cost, the Food Co-op Club boasts that they have 5000 members and a 200% increase in sales. The markup is 36% based on cost. What would be their percent markup if selling price were the base? Round to the nearest hundredth percent.