What is the most cost-effective way to recharge Polk City?

It is appropriate to buy star coins with bank cards.

There are gifts. The following is the recharge situation and the gift of star coins.

10 yuan = 1 18000 SGD, which is equivalent to giving you 1.8 yuan.

20 yuan = 236,000 SGD, which is equivalent to giving you a 3.6 yuan.

30 yuan = 360,000 SGD, which is equivalent to giving you a 6 yuan.

50 yuan = 600,000 yuan, which is equivalent to you 10 yuan.

100 yuan =1200,000 star coins, which is equivalent to giving you 20 yuan.

200 yuan = 2,400,000 Singapore dollars, which is equivalent to giving you a 40 yuan.

500 yuan = 6 million yuan, which is equivalent to giving you 100 yuan.