100个以上 批发价的九折 英语怎么说

90% discount for buying 100 pieces and above.

10% off for the quantity of more than 100 pieces/units.

千万不要说90%，英语的表达法是把折掉的部分写出来，然后加off。

give 10 per cent discount of the wholesale prices as long as you buy over 100