I read following deal $68 享 Surya Restaurant 印度菜 x 尼泊爾菜自助午餐 (原價 $136),已包加一! - Babybamboo | 香港團購

it shows a lunch $ 68 - 50 % discount.

I remember I had a lunch there couple of months back and I paid only $ 68 for a lunch.

how can they claim 50 % discount for $ 68 ??