Math Problem (Level 2) : Discounted ticket price (CC12)

The price for the ticket from A station to B station is 2000 yen.
By the coupon ticket of a six-sheet set, it becomes 18% discount and by the coupon ticket of a ten-sheet set, it becomes 20% discount.
You buy tickets for 48 persons combining these tickets or coupon tickets.
When you buy them by the cheapest combination, find the price per person.



Answer
1615 yen