If you want to calculate how much you need to charge your guests in order to get the payout you want, you can use the formula below to figure out the exact number:
Sales (the amount of a payout you want) ÷ 0.82 = Price (how much you charge guests)
The sales will be 82% of the price since you will be paying 18% as a platform usage fee.
If you want ¥900 per adult guest as a payout:
You need to set the price per adult guest to ¥1,097.
If the price calculated has fraction digits, please round up to the next whole dollar.