A nursery bought 100 Christmas trees for $4500.00; 50 trees were sold at a markup of 35%

Question:

A nursery bought 100 Christmas trees for $4500.00; 50 trees were sold at a markup of 35% of cost, 40 trees were sold for $52 each, and the remaining trees were sold at 33% below cost. Assume all the trees had the same cost.
(a) What was the markup realized on the purchase?
(b) What was the percent markup realized based on cost?
(c) What was the gross profit realized based on selling price?