COST OF IMPOVING STADIUM

10M FOR 10,000 SEATS 
15M FOR 15,000 SEATS 
20M FOR 20,000 SEATS
45M FOR 25,000 SEATS
50M FOR 30,000 SEATS
55M FOR 35,000 SEATS
60M FOR 40,000 SEATS

Example 11897 and you send 20m you get 32000 seat