Answer:
1st of October is the last day discount would be given if payment is received
Explanation:
2/10 means that a discount rate of 2% would given to the buyer if he or she pays within next in ten days otherwise full amount is expected in 30 days i.e n/30.
The discount would be available if payment is made between September 22 and October 1st
In essence,the last day Sunshine Builders can pay the invoice and still receive a discount is 1st October