Solve the given problem then show the computation in two decimal places.
1. An item has a selling price of P 360.00 and cost of P 300.00. Find : Mark-up, Mark-up rate based on cost, mark-up rate based on selling price.

2. Grace sold her bag for P600.00 and earned a mark-up of P150.00. Find the cost, mark-up rate based on cost, mark-up rate based on selling price.

3. How much is the markdown and its markdown rate based on original selling price if an item has an original selling price of P420.00 and new selling price of P380.00?​