Answer:
save up and pay cash
Step-by-step explanation:
paying cash is always the best idea and not trying to get so much debit. If you did one other otion and have the debit some emergency can come up and you will not be able to pay for that, and aying cash you save more money
By plugging (k-2) in t, we can write that

P-.15p this is the expression for cost after discount
and its just .15p for just the discount