Student or Learner
could you please tell me which preposition should be used in the following sentences:
1) The acknowledged order must be returned within 4 days of/from receipt of the order.
2) 30% of the price shall be paid upon delivery of a binding order with the term of payment of 30 days of/from the date of issue of the invoice
Thank you very much
1) within 4 days of: in this example the preposition refers to an action (i.e. the recepit of the order)
2) 30 days from: in this example the preposition refers to a point in time (i.e. "the date of issue of the invoice").
Hope this clarifies things for you.