There is a deal for buying mobile telephones from New York.

Following are details :

Nr of pieces : $1\mathrm{.}000$ mobile phones. Price : $ $450.-$per unit $($if

paid immediately $)$

Payment conditions :

Cash payment : $$\frac{450}{?}$ unit

Cash against Documents : $$455.-$per unit $($estimated

maturity time $30$ days$)$

Open Account : $465.-$per unit $($estimated maturity time $60$

days$)$

The company doesn't have cash money. So$,$ if they choose

CASH option they must go and borrow a loan from the bank. If

they do this, bank will give the loan with interest rate $\%8$ and

with maturity $30$ or $60$ days.

There is no problem for selling the goods. They will be sold

immediately at appropriate maturity time.

QUESTION :

Please show the calculations of the result for $3$ options and explain

which one will be to the benefit of the company.