First find how much the roses for one centerpiece cost: $5/rose * 10 roses = $<<5*10=50>>50
Then find how much the lilies for one centerpiece cost: $4/rose * 15 roses = $<<4*15=60>>60
Then find how much the table settings for one table cost: 4 settings * $10/setting = $<<4*10=40>>40
Then add the cost of both types of flowers, the place settings, and the tablecloth to find the total cost per table: $50 + $60 + $40 + $25 = $<<50+60+40+25=175>>175
Then multiply the cost per table by the number of tables to find the total cost: $175/table * 20 tables = $<<175*20=3500>>3500
#### 3500