receive ”Iphone 7” and (before ”12 December 2016” pay 125 US$ or before ”1 Jan 2017” pay 140 US$) • Interests for late payments • Pay x or pay x*(100 + rate)/100 *(Date-duedate)/365 • Cash Discount • At deliverydate Pay x*(100-y)/100 at delivery or after deliverrydate pay x • Installments • At date receive z and pay 5 times 100 US$ for 5 months • We can now easily combine these options (and determine which combinations makes sense) 15